Remove placeholder comment from pipeline file

Author: elliedori

.github/workflows/pr-build-workflow.yml

@@ -23,5 +23,3 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
       - name: Build with Gradle
         run: ./gradlew clean build --no-daemon --stacktrace
-
-# placeholder comment