[WIN32K][NTUSER] Tiny codestyle fix to NtUserLockWindowUpdate (#1066)

Fix indentation (inconsistent with the rest of the file) and return actual BOOL.

win32ss/user/ntuser/ntstubs.c

@@ -918,9 +918,8 @@ NtUserCtxDisplayIOCtl(
 BOOL APIENTRY
 NtUserLockWindowUpdate(HWND hWnd)
 {
-   STUB
-
-   return 0;
+    STUB;
+    return FALSE;
 }
 
 DWORD APIENTRY