Fix manifest var names

Author: john-david3

Makefile

@@ -183,7 +183,7 @@ run: build ## Run code
 
 dev: ## Run agent executable
 	@echo "🚀 Running App"
-	COLLECTOR_CONFIG_PATH=$(COLLECTOR_PATH) MANIFEST_DIR_PATH=$(MANIFEST_DIR) $(GORUN) -ldflags=$(DEBUG_LDFLAGS) $(PROJECT_DIR)/$(PROJECT_FILE)
+	NGINX_AGENT_COLLECTOR_CONFIG_PATH=$(COLLECTOR_PATH) NGINX_AGENT_MANIFEST_DIR=$(MANIFEST_DIR) $(GORUN) -ldflags=$(DEBUG_LDFLAGS) $(PROJECT_DIR)/$(PROJECT_FILE)
 
 race-condition-dev: ## Run agent executable with race condition detection
 	@echo "🏎️ Running app with race condition detection enabled"