new boolean property applyDefaultFont for rtf editor and using it in mail compose

making sure it applyDefaultFont method gets always called in compose

mail/js/app.js

@@ -5466,9 +5466,6 @@ app.classes.mail = AppJS.extend(
 			this.compose_submitAction(false);
 		}
 
-		// apply default font and -size before submitting to server for sending
-		this.et2?.getWidgetById('mail_htmltext')?.applyDefaultFont();
-
 		return false;
 	},