Suppress MsgBox when Wizard is running in silent mode (#76215)

* Suppress MsgBox when Wizard running in silent mode

* Suppress MsgBox when Wizard running in silent mode

build/win32/code.iss

@@ -1034,7 +1034,7 @@ begin
       AltArch := '32';
     end;
 
-    if not Result then begin
+    if not Result and not WizardSilent() then begin
       MsgBox('Please uninstall the ' + AltArch + '-bit version of {#NameShort} before installing this ' + ThisArch + '-bit version.', mbInformation, MB_OK);
     end;
   end;