Sort offline update items case-insensitively

Nate Grahamrequested to merge
ngraham/discover:sort-offline-update-text-case-insensitively into master

Just like we sort online updates, which was implemented in a58ac127.

BUG: 500661
CCBUG: 499638
FIXED-IN: 6.3.3

Before After
Before After
Edited by Nate Graham

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