Fix query selector for inverted icons

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

apps/accessibility/css/dark.scss

@@ -22,7 +22,8 @@ $color-border-dark: lighten($color-main-background, 14%);
 #contactsmenu-menu a,
 #expanddiv a,
 .activity-section .activity-icon.monochrome {
-	img :not(.avatardiv){
+	& > img,
+	:not(.avatardiv) > img {
 		filter: invert(100%);
 	}
 }
@@ -84,4 +85,4 @@ input[type=checkbox] {
 			background-image: url('../../../core/img/actions/checkbox-mixed-dark.svg');
 		}
 	}
-}
+}