gdatetime test: Consistently expect %k to generate a figure space

Merged Simon McVittie requested to merge wip/smcv/more-figure-spaces into main

This part of test_non_utf8_printf() was missed while converting other test expectations to look for a figure space, probably because it is only run if a legacy ja_JP.eucjp locale exists. Debian generates a fairly comprehensive set of locales (including some that are non-UTF-8) while running GLib's installed-tests, so this was caught by CI.

Fixes: 7074122f "gdatetime: Pad numbers with numeric space"

Edited by Simon McVittie

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