Fix regression in syntax highlighting

Specifically, fix trailing comments improperly
rendered as filter option.

Regression from:
- https://github.com/gorhill/uBlock/commit/6d8b310d9422#diff-fb99537d908d0afc8d76e7c98bbc9fea

src/js/codemirror/ubo-static-filtering.js

@@ -165,7 +165,7 @@ CodeMirror.defineMode('ubo-static-filtering', function() {
         }
         if (
             parserSlot >= parser.optionsSpan.i &&
-            parserSlot < parser.rightSpaceSpan.i
+            parserSlot < parser.commentSpan.i
         ) {
             const bits = parser.slices[parserSlot];
             let style;