Delete duplicate define (#46202)

The exact same thing exists 2 lines above that

Author: Suchiman

src/Servers/IIS/AspNetCoreModuleV2/OutOfProcessRequestHandler/serverprocess.h

@@ -16,7 +16,6 @@
 #define ASPNETCORE_PORT_ENV_STR                     L"ASPNETCORE_PORT="
 #define ASPNETCORE_APP_PATH_ENV_STR                 L"ASPNETCORE_APPL_PATH="
 #define ASPNETCORE_APP_TOKEN_ENV_STR                L"ASPNETCORE_TOKEN="
-#define ASPNETCORE_APP_PATH_ENV_STR                 L"ASPNETCORE_APPL_PATH="
 
 class PROCESS_MANAGER;