fix path

Author: WikiHacker

.github/workflows/NanoPi-R4S RK3399 OpenWrt 19.07 Build.yml

@@ -168,7 +168,7 @@ jobs:
       - name: Custom Configure Files
         run: |
           rm -f code/friendlywrt/.config*
-          cp r4s-rk3399-config code/configs/config_rk3399
+          cp config/r4s-rk3399-config code/configs/config_rk3399
 
       - name: Set Default Values
         run: |