merge: Fixed broken line numbers (!471)

View MR for information: TransFem-org/Sharkey!471



Approved-by: Amelia Yukii <amelia.yukii@shourai.de>
Approved-by: Luna <her@mint.lgbt>

packages/frontend/src/components/MkCode.core.vue

@@ -77,7 +77,7 @@ watch(() => props.lang, (to) => {
   counter-increment: step 0;
 }
 
-.codeBlockRoot :global(.shiki) > code > .line::before {
+.codeBlockRoot :global(.shiki) > code > span::before {
   content: counter(step);
   counter-increment: step;
   width: 1rem;