chore: Fix condition on nightly lint job of check workflow

Author: jhg

.github/workflows/checks.yml

@@ -88,7 +88,7 @@ jobs:
   nightly-lint:
     runs-on: ubuntu-latest
     timeout-minutes: 5
-    if: endsWith(github.ref, '-nightly') || github.event_name != 'schedule'
+    if: endsWith(github.ref, '-nightly') && github.event_name != 'schedule'
     steps:
     - uses: actions/checkout@v2
     - uses: actions-rs/toolchain@v1