Fix dashboard icon on dark mode again

There was a generic filter in the past, but it was removed with
https://github.com/nextcloud/server/commit/1d35a53991f356976d78b8053651737821502687

So now we apply the filter at our best knowledge

Signed-off-by: Joas Schilling <coding@schilljs.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/css/icons.css b/css/icons.css
index a390d3651..64cf1b8e8 100644
--- a/css/icons.css
+++ b/css/icons.css
@@ -82,4 +82,5 @@
 
 .dashboard-talk-icon {
 	background-image: url(../img/app-dark.svg);
+	filter: var(--background-invert-if-dark);
 }