win-capture: Use full DLL path for inject helper

The inject helper should be able to specify the full path rather than
assume the path of the hook DLL.  This change allows us to modify the
hook's location.  This needs to be done because the hook needs to be
relocated to ProgramData to prevent the possibility of multiple Vulkan
capture hooks.

plugins/win-capture/game-capture.c

@@ -930,7 +930,7 @@ static inline bool inject_hook(struct game_capture *gc)
 	} else {
 		info("using helper (%s hook)",
 		     use_anticheat(gc) ? "compatibility" : "direct");
-		success = create_inject_process(gc, inject_path, hook_dll);
+		success = create_inject_process(gc, inject_path, hook_path);
 	}
 
 cleanup: