Setup: Ensure DWM patcher service is unregistered during servicing

ExplorerPatcher/InputSwitch.h

@@ -28,6 +28,7 @@ typedef struct __MIDL___MIDL_itf_inputswitchserver_0000_0000_0003
     BOOL fDisabled;
     BOOL fHidden;
     WCHAR* pszIconGlyph;
+    void* pUnk1; // @Note: Added in 22621.4974
 } INPUT_SWITCH_IDL_IME_MODE_ITEM_DATA;
 
 typedef enum __MIDL___MIDL_itf_inputswitchserver_0000_0000_0004

ep_setup/ep_setup.c

@@ -1162,9 +1162,9 @@ int WINAPI wWinMain(
         {
             bAreRoundedCornersDisabled = GetLastError() == ERROR_ACCESS_DENIED;
         }
-        if (bAreRoundedCornersDisabled)
-        {
         RegisterDWMService(0, 1);
+        if (bInstall && bAreRoundedCornersDisabled)
+        {
             RegisterDWMService(0, 3);
         }