Add banned user icon color variables

Add new css variables for setting the background color used in the
banned users icon.

Author: lyyder

src/components/IconBannedUser/IconBannedUser.css

@@ -1,11 +1,11 @@
 @import '../../marketplace.css';
 
 .backgroundLight {
-  stop-color: var(--marketplaceColorLight);
+  stop-color: var(--bannedColorLight);
 }
 
 .backgroundDark {
-  stop-color: var(--marketplaceColor);
+  stop-color: var(--bannedColorDark);
 }
 
 .foregroundFill {

src/marketplace.css

@@ -53,6 +53,8 @@
   --successColorDark: #239954;
   --failColor: #ff0000;
   --attentionColor: #ffaa00;
+  --bannedColorLight: var(--marketplaceColorLight);
+  --bannedColorDark: var(--marketplaceColor);
 
   --matterColorDark: #000000;
   --matterColor: #4a4a4a;