Made multiple select a pro feature

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

@@ -549,6 +549,7 @@ public class FragmentMessages extends FragmentEx {
         fabMove.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                if (Helper.isPro(getContext())) {
                     Bundle args = new Bundle();
                     args.putLong("folder", folder);
 
@@ -663,6 +664,11 @@ public class FragmentMessages extends FragmentEx {
                             Helper.unexpectedError(getContext(), ex);
                         }
                     }.load(FragmentMessages.this, args);
+                } else {
+                    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
+                    fragmentTransaction.replace(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
+                    fragmentTransaction.commit();
+                }
             }
         });