Issue #1924528 by JohnAlbin: Fixed Remove aggregator.theme.css deprecated by...

Issue #1924528 by JohnAlbin: Fixed Remove aggregator.theme.css deprecated by entity conversion #293318.

core/modules/aggregator/aggregator.theme-rtl.css

-/**
- * Right-to-Left styles for theme in the Aggregator module.
- */
-
-.aggregator .feed-icon {
-  float: left;
-}

core/modules/aggregator/aggregator.theme.css

-/**
- * Styles for theme in the Aggregator module.
- */
-
-.aggregator .feed-icon {
-  float: right; /* LTR */
-  display: block;
-}