CI: fix test dir name in ci

Author: raycadle

.github/workflows/test-tag.yml

@@ -28,7 +28,7 @@ jobs:
           pip install -r requirements-tests.txt
 
       - name: Run tests with coverage
-        run: pytest --cov=wallhavenapi --cov-report=term-missing --cov-report=xml --cov-report=html /tests
+        run: pytest --cov=wallhavenapi --cov-report=term-missing --cov-report=xml --cov-report=html tests/
 
       - name: Upload coverage reports artifact
         uses: actions/upload-artifact@v4