Catch std::exception by reference (#20385)

installer/PowerToysSetupCustomActions/CustomAction.cpp

@@ -982,7 +982,7 @@ UINT __stdcall UnRegisterContextMenuPackagesCA(MSIHANDLE hInstall)
             }
         }
     }
-    catch (std::exception e)
+    catch (std::exception& e)
     {
         std::string errorMessage{ "Exception thrown while trying to unregister sparse packages: " };
         errorMessage += e.what();