Do not show MsgBox if /SUPPRESSMSGBOXES is active (#1654)

Co-authored-by: Sebastian Pohle <605124+sepo@users.noreply.github.com>
Co-authored-by: Raivis Dejus <raivisd@scandiweb.com>

Author: sepo

installer.iss

@@ -74,7 +74,7 @@ begin
   if CurUninstallStep = usPostUninstall then
   begin
     if RegKeyExists(HKEY_CURRENT_USER, '{#AppRegKey}') then
-      if MsgBox('Do you want to delete Buzz settings and saved files?', mbConfirmation, MB_YESNO) = IDYES
+      if SuppressibleMsgBox('Do you want to delete Buzz settings and saved files?', mbConfirmation, MB_YESNO, IDNO) = IDYES
       then
       begin
         RegDeleteKeyIncludingSubkeys(HKEY_CURRENT_USER, '{#AppRegKey}');