Messaging: Allow deletion of messages without a sim inserted

* Currently there is a check in place checking for the presence of a
  preferred sim card
* For deletion of a conversation and message this is unnecessary and
  deleting a conversation from the main view does also not have that check
  already, so replace the check with just checking for being the default
  messaging app

Fixes: https://gitlab.com/LineageOS/issues/android/-/issues/5974
Test: Try deleting a single message or conversation from within
 conversation before and after
Change-Id: Icd47882eb29e16a17ad57a79ea5e0c0f7855ffc6

src/com/android/messaging/ui/conversation/ConversationFragment.java

@@ -819,7 +819,7 @@ public class ConversationFragment extends Fragment implements ConversationDataLi
                 return true;
 
             case R.id.action_delete:
-                if (isReadyForAction()) {
+                if (isReadyForDeleteAction()) {
                     new AlertDialog.Builder(getActivity())
                             .setTitle(getResources().getQuantityString(
                                     R.plurals.delete_conversations_confirmation_dialog_title, 1))
@@ -1073,6 +1073,10 @@ public class ConversationFragment extends Fragment implements ConversationDataLi
         return UiUtils.isReadyForAction();
     }
 
+    public boolean isReadyForDeleteAction() {
+        return UiUtils.isReadyForDeleteAction();
+    }
+
     /**
      * When there's some condition that prevents an operation, such as sending a message,
      * call warnOfMissingActionConditions to put up a snackbar and allow the user to repair
@@ -1142,7 +1146,7 @@ public class ConversationFragment extends Fragment implements ConversationDataLi
     }
 
     void deleteMessage(final String messageId) {
-        if (isReadyForAction()) {
+        if (isReadyForDeleteAction()) {
             final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
                     .setTitle(R.string.delete_message_confirmation_dialog_title)
                     .setMessage(R.string.delete_message_confirmation_dialog_text)
@@ -1178,7 +1182,7 @@ public class ConversationFragment extends Fragment implements ConversationDataLi
     }
 
     public void deleteConversation() {
-        if (isReadyForAction()) {
+        if (isReadyForDeleteAction()) {
             final Context context = getActivity();
             mBinding.getData().deleteConversation(mBinding);
             closeConversation(mConversationId);

src/com/android/messaging/util/UiUtils.java

@@ -349,6 +349,18 @@ public class UiUtils {
                 phoneUtils.isDefaultSmsApp();
     }
 
+    /**
+     * Called to check if a message or conversation can be deleted - it needs to be the default
+     * sms app
+     * @return true if all conditions are nominal and we're ready to delete a message
+     */
+    public static boolean isReadyForDeleteAction() {
+        final PhoneUtils phoneUtils = PhoneUtils.getDefault();
+
+        // Is the default sms app?
+        return phoneUtils.isDefaultSmsApp();
+    }
+
     /*
      * Removes all html markup from the text and replaces links with the the text and a text version
      * of the href.