ci: fix indentation in selenium workflow

From rabbitmq#14014, we learned that the indentation was causing workflows to
not trigger. However, this did not seem to affect when the workflow file
itself was changed. In any case, YAML is sensible to indentation,
therefore this change is 'correct'. Removing single quotes from paths
with '*' at the end, because it is not required according to YAML and
GitHub documentation.

The path triggers now match the Selenium workflow that runs on commits
to main and release branches.

Author: Zerpet

.github/workflows/test-management-ui-for-pr.yaml

@@ -1,10 +1,13 @@
 name: Test Management UI with Selenium for PRs
 on:
-   pull_request:
-     paths:
-     - 'deps/**'
-     - 'selenium/**'
-     - .github/workflows/test-management-ui-for-pr.yaml
+  pull_request:
+    paths:
+      - deps/rabbitmq_management/src/**
+      - deps/rabbitmq_management/priv/**
+      - deps/rabbitmq_web_dispatch/src/**
+      - selenium/**
+      - scripts/**
+      - .github/workflows/test-management-ui-for-pr.yaml
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true