[sqlite backport] Fix collation dequoting.

Backport https://www.sqlite.org/src/info/eddc05e7bb31fae7
"Fix a problem causing collation sequence names to be dequoted
multiple times under some circumstances."

BUG=469082

Review URL: https://codereview.chromium.org/1022423004

Cr-Commit-Position: refs/heads/master@{#322165}
7 files changed