Fix status badge background making text invisible

The badge() style function used rgb-to-rgba string replacement for
the background, which doesn't work with hex colors. Hex colors passed
through unchanged as opaque backgrounds, hiding the text. Use hex
alpha notation (color + '26' = ~15% opacity) instead.

frontend/src/components/pages/JiraPage.js

@@ -99,7 +99,7 @@ const STYLES = {
     fontSize: '0.7rem',
     fontWeight: 600,
     border: `1px solid ${color}`,
-    background: color.replace(')', ', 0.15)').replace('rgb', 'rgba'),
+    background: `${color}26`,
     color: color,
   }),
   modal: {