[SPEC-7971] Update gem module name to match cmake target name (#3055)

Fixes for module names so they match cmake target name

Gems/AWSGameLift/Code/AWSGameLiftClient/Source/AWSGameLiftClientModule.cpp

@@ -42,4 +42,4 @@ namespace AWSGameLift
     };
 }// namespace AWSGameLift
 
-AZ_DECLARE_MODULE_CLASS(Gem_AWSGameLift_Client, AWSGameLift::AWSGameLiftClientModule)
+AZ_DECLARE_MODULE_CLASS(Gem_AWSGameLift_Clients, AWSGameLift::AWSGameLiftClientModule)

Gems/AWSGameLift/Code/AWSGameLiftServer/Source/AWSGameLiftServerModule.cpp

@@ -42,4 +42,4 @@ namespace AWSGameLift
     };
 }// namespace AWSGameLift
 
-AZ_DECLARE_MODULE_CLASS(Gem_AWSGameLift_Server, AWSGameLift::AWSGameLiftServerModule)
+AZ_DECLARE_MODULE_CLASS(Gem_AWSGameLift_Servers, AWSGameLift::AWSGameLiftServerModule)

Gems/Multiplayer/Code/Source/Debug/MultiplayerDebugModule.cpp

@@ -28,4 +28,4 @@ namespace Multiplayer
     }
 }
 
-AZ_DECLARE_MODULE_CLASS(Gem_Multiplayer_Imgui, Multiplayer::MultiplayerDebugModule);
+AZ_DECLARE_MODULE_CLASS(Gem_Multiplayer_Debug, Multiplayer::MultiplayerDebugModule);