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/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.