Update makefile (#445)

makefile

@@ -1,7 +1,7 @@
 .SILENT:
 setup:
 	echo "creating ./backend/test_config.yaml for local testing..." && \
-	if [ ! -f backend/test__config.yaml ]; then \
+	if [ ! -f backend/test_config.yaml ]; then \
 		cp backend/config.yaml backend/test_config.yaml; \
 	fi
 	echo "installing swagger needed to generate backend api docs..." && \