[perl #40783] [CAGE] get fixme.t to check for an RT ticket number after TODO items

[Paul Cochrane]

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Currently t/codingstd/fixme.t only searches for, and reports error on,
the strings: FIXME|XXX|TODO. The test should check for an RT ticket
number following the FIXME|XXX|TODO string and *not* report this as an
error since the item is already known and in the RT queue.

[Will Coleda via RT]

Done in r15324.