MdeModulePkg: BOOLEAN type needn't to compare to TRUE/FALSE explicitly

Fix this issue to follow the coding style.

Cc: Qiu Shumin <shumin.qiu@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>

MdeModulePkg/Universal/HiiDatabaseDxe/ConfigRouting.c

@@ -939,7 +939,7 @@ CompareAndMergeDefaultString (
   //
   // If the ConfigAltResp has no change,no need to update the content in AltCfgResp.
   //
-  if (ConfigAltRespChanged == FALSE) {
+  if (!ConfigAltRespChanged) {
     Status = EFI_SUCCESS;
     goto Exit;
   }