Fixed bug in Makefile (update_srv rule)

Makefile

@@ -129,7 +129,7 @@ save_old_srv_binaries:
 
 copy_binaries_srv:
 	@echo "Copying server binaries"
-	@cp $(BUILD_DIR)/$(SERVER_BINARY) src/server/nexus-server $(SERVER_BASEDIR)/bin
+	@cp $(BUILD_DIR)/$(SERVER_BINARY) $(SERVER_BASEDIR)/bin
 	@cp $(BUILD_DIR)/$(GENPWD_BINARY) $(SERVER_BASEDIR)/bin
 	@cp tools/template_creator $(SERVER_BASEDIR)/bin
 	@cp tools/vm_run $(SERVER_BASEDIR)/bin