AOSP/Messaging - Update language to comply with Android's inclusive language guidance.

See https://source.android.com/setup/contribute/respectful-code for reference

BUG=161896447

Test: make and make messagingtests
Change-Id: I01c520f1d5e9eab8dbb25b08d133ae34bd301093

src/com/android/messaging/mmslib/pdu/PduComposer.java

@@ -1080,7 +1080,7 @@ public class PduComposer {
             }
 
             if (dataLength != (attachment.getLength() - headerLength)) {
-                throw new RuntimeException("BUG: Length sanity check failed");
+                throw new RuntimeException("BUG: Length check failed");
             }
 
             mStack.pop();