fix: crash on macOS, due to running Connection.ShowWarnings directly in the TQueryThread

Refs #2425

source/apphelpers.pas

@@ -3144,7 +3144,6 @@ begin
     end;
     FConnection.SetLockedByThread(nil);
     Synchronize(AfterQuery);
-    FConnection.ShowWarnings;
     // Check if FAborted is set by the main thread, to avoid proceeding the loop in case
     // FStopOnErrors is set to false
     if FAborted or ErrorAborted then

source/main.pas

@@ -3332,6 +3332,7 @@ begin
       Tab.tabsetQuery.OnChange(Tab.tabsetQuery);
     end;
   end;
+  Thread.Connection.ShowWarnings;
   ShowStatusMsg;
 end;