Revert "preview_comment.yaml: increase file_limit for test"

This reverts commit b4e9c78.

Author: adriendupuis

.github/workflows/preview_comment.yaml

@@ -27,7 +27,7 @@ jobs:
 
             -   name: Create comment for changed files
                 run: |
-                    file_limit=200
+                    file_limit=100
                     build_url="https://ez-systems-developer-documentation--${{ github.event.pull_request.number }}.com.readthedocs.build/${{inputs.project}}en/${{ github.event.pull_request.number }}/"
 
                     md_change_list=$(git diff --name-only HEAD "origin/$GITHUB_BASE_REF" -- docs/ | grep -E "^docs\/.*\.md$" | sed -E "s|^docs/(.*)\.md$|- [docs/\1.md](${build_url}\1/)|")