Clear composing signature/template

app/src/main/java/eu/faircode/email/FragmentAnswer.java

@@ -161,6 +161,8 @@ public class FragmentAnswer extends FragmentBase {
     }
 
     private void onActionSave() {
+        etText.clearComposingText();
+
         Bundle args = new Bundle();
         args.putLong("id", id);
         args.putString("name", etName.getText().toString());

app/src/main/java/eu/faircode/email/FragmentIdentity.java

@@ -524,6 +524,8 @@ public class FragmentIdentity extends FragmentBase {
                 name = hint.toString();
         }
 
+        etSignature.clearComposingText();
+
         Bundle args = new Bundle();
         args.putLong("id", id);
         args.putString("name", name);