Fix labeler labelling everything as backend (#2041)

Author: Gold856

.github/labeler.yml

@@ -1,7 +1,8 @@
 "backend":
-  - changed-files:
-      - any-glob-to-any-file: [photon-core/**, photon-server/**]
-      - all-globs-to-all-files: "!photon-server/src/main/resources/web/index.html"
+  - all:
+      - changed-files:
+          - any-glob-to-any-file: [photon-core/**, photon-server/**]
+          - all-globs-to-all-files: "!photon-server/src/main/resources/web/index.html"
 "documentation":
   - changed-files:
       - any-glob-to-any-file: [docs/**, photon-docs/**]