style: Hide border on carousel buttons for non-Adwaita themes
This makes no difference to the carousel appearance using the default theme (Adwaita), but should fix some glitches with other themes. Investigated by Milan Crha. Signed-off-by: Philip Withnall <pwithnall@endlessos.org> Fixes: #1159
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| passed | debian-stable-x86_64 |
#1190337
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00:03:50
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| passed | fedora-x86_64 |
#1190336
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00:06:37
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