[matchesonscrollbar addon] Fix possible discrepancy with search query

The scrollbar annotations may fail to match search query under
certain circumstances. This happens when the search cursor is
`multiline: false`.

The matchesonscrollbar addon does not have a way to indicate
`multiline: false`, the multiline status is heuristically
determined and because of this it may end up being opposite
of the status of the search cursor.

Author: gorhill

addon/search/matchesonscrollbar.js

@@ -46,7 +46,7 @@
       if (match.from.line >= this.gap.to) break;
       if (match.to.line >= this.gap.from) this.matches.splice(i--, 1);
     }
-    var cursor = this.cm.getSearchCursor(this.query, CodeMirror.Pos(this.gap.from, 0), this.caseFold);
+    var cursor = this.cm.getSearchCursor(this.query, CodeMirror.Pos(this.gap.from, 0), {caseFold: this.caseFold, multiline: this.options.multiline});
     var maxMatches = this.options && this.options.maxMatches || MAX_MATCHES;
     while (cursor.findNext()) {
       var match = {from: cursor.from(), to: cursor.to()};