Fix selected line color in arc-green (go-gitea#11492) (go-gitea#11520)

Co-authored-by: techknowlogick <[email protected]>
(cherry picked from commit 6da87ed)

Author: CirnoT

web_src/less/themes/theme-arc-green.less

@@ -1137,7 +1137,7 @@ td.blob-excerpt {
     background-color: rgba(0, 0, 0, .15);
 }
 
-.lines-code .code-view .active {
+.code-view .lines-code .active {
     background: #534d1b;
 }