fix(svg symbols): fixes missing title IDs

affects: @buildit/gravity-ui-web

Fixes a bug in our build process that caused the IDs for SVG symbols' <title> elements to be
omitted. This cuased an a11y issue because those IDs are needed in order for inlined instances of
those SVGs on a page to have text alternatives.

ISSUES CLOSED: #369

packages/gravity-ui-web/gulp/ui-lib.js

@@ -164,8 +164,8 @@ function svgSymbolsTask() {
         // Add an ID to the <title> element of each SVG symbol
         // This is so that we can later reference it via
         // aria-labelledby for better a11y.
-        $('symbol').each(() => {
-          const symbol = $(this);
+        $('symbol').each((index, element) => {
+          const symbol = $(element);
           const symbolId = symbol.attr('id');
           const title = symbol.children('title');
           title.attr('id', symbolId + titleIdSuffix);