[ci] Remove duplicated build step for doxygen job.

There doesn't seem to be a difference between the build configs, so the
duplicated step was removed.

Author: hageboeck

.github/workflows/root-docs-ci.yml

@@ -75,22 +75,7 @@ jobs:
         echo TAR_NAME=html${BASE_REF}.tar >> $GITHUB_ENV
         echo DOCDIR_NAME=${BASE_REF} >> $GITHUB_ENV
 
-    - name: Build ROOT - Workflow Dispatch
-      if:   github.event_name == 'workflow_dispatch'
-      env:
-          INCREMENTAL: ${{ inputs.incremental == 'true' }}
-      run: ".github/workflows/root-ci-config/build_root.py
-                  --buildtype      Release
-                  --platform       ${{ env.PLATFORM }}
-                  --incremental    ${{ env.INCREMENTAL }}
-                  --base_ref       ${BASE_REF}
-                  --head_ref       ${BASE_REF}
-                  --binaries       false
-                  --repository     ${{ github.server_url }}/${{ github.repository }}
-                  --overrides      ${OVERRIDES}"
-
-    - name: Build ROOT - Schedule
-      if:   github.event_name == 'schedule'
+    - name: Build ROOT
       run: ".github/workflows/root-ci-config/build_root.py
                   --buildtype      Release
                   --platform       ${{ env.PLATFORM }}