Fix new project dialog allowing creation of new code projects even if an IDE is not installed.

#rb none
#jira UE-71070
#rnx

#ROBOMERGE-OWNER: ryan.gerleve
#ROBOMERGE-AUTHOR: ben.marsh
#ROBOMERGE-SOURCE: CL 5343356 in //UE4/Release-4.22/... via CL 5343357
#ROBOMERGE-BOT: ENGINE (Main -> Dev-Networking)

[CL 5401615 by ben marsh in Dev-Networking branch]

Engine/Source/Developer/SourceCodeAccess/Private/SourceCodeAccessModule.cpp

@@ -86,7 +86,7 @@ bool FSourceCodeAccessModule::IsSourceCodeAccessorAvailable(FName Name) const
 	{
 		if (Accessor->GetFName() == Name)
 		{
-			return true;
+			return Accessor->CanAccessSourceCode();
 		}
 	}
 	return false;