CI: Do NOT close Gerrit PRs by default

Change-Id: Ied0103ce05226fbb0efdd5ad9cdd47c9281af3b0
Signed-off-by: Matthew Watkins <mwatkins@linuxfoundation.org>

Author: ModeSevenIndustrialSolutions

.github/workflows/github2gerrit.yaml

@@ -25,7 +25,7 @@ on:
       preserve_github_prs:
         description: "Do NOT close GitHub PRs after pushing to Gerrit"
         required: false
-        default: false
+        default: true
         type: boolean
       allow_duplicates:
         description: "Allow duplicate changes to be raised in Gerrit"