[O] Fix for bug in org-capture

[Robert Goldman]

I tried to make two submenus to my org-capture templates: a prefix key
"t" (for TODO) and a prefix key "T" (for today's TODO).

When I tried to use them, the "T" key did not appear and was not accepted.

Looking more deeply, it appears that it was filtered out by a mistakenly
case-folding (or at least potentially case-folding) search in org-capture.

I am attaching a diff which has the two line fix for this bug.

org-capture.patch
Description: Text document