Fix assets build failure on glitch-soc

app/javascript/styles/mastodon/rich_text.scss

@@ -44,7 +44,7 @@
       content: '';
       width: 24px;
       height: 20px;
-      mask-image: url('../images/quote.svg');
+      mask-image: url('~images/quote.svg');
       background-color: var(--rich-text-decorations-color);
       position: absolute;
       inset-inline-start: 0;