Removed control statement that was effecting return

 code status, instead rely on on/pull_requests/paths to identify matching paths. Change prettier configuration to use single space indenting. Updated package-lock.json with new indenting. Added configuration to define node and npm versions.

.github/workflows/check.yml

@@ -17,7 +17,4 @@ jobs:
         run: npm install prettier
 
       - name: Check formatting
-        run: |
-          if [[ -n "$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }} -- horreum-web/package-lock.json)" ]]; then
-            npx prettier --check "horreum-web/package-lock.json"
-          fi
+        run: npx prettier --check "horreum-web/package-lock.json"

horreum-web/.prettierrc

@@ -3,7 +3,7 @@
   "trailingComma": "es5",
   "singleQuote": false,
   "printWidth": 120,
-  "tabWidth": 2,
+  "tabWidth": 1,
   "arrowParens": "avoid",
   "useTabs": false
 }