GH-89: Bugfix: Use Bootstrap "warning" pill color

Why?
1. The Bootstrap "success" pill color is used.
    - See `badge-success` in HTML but not CSS.
2. The custom warning color was recently removed.
    - #312
3. The Portal success, warn, etc colors are not standardized.
    - They will be in FP-1145, but CMS's could differ.

taccsite_cms/contrib/taccsite_system_monitor/static/taccsite_system_monitor/css/system_monitor.css

@@ -75,10 +75,6 @@ Styleguide Trumps.Scopes.SystemMonitor
   font-size: 1.3rem;
   font-weight: normal;
 }
-.s-system-monitor .badge-warning {
-  background-color: var(--global-color-warning--normal);
-  color: var(--global-color-primary--xx-light);
-}
 
 /* Overwrite IconWorks */
 .s-system-monitor .iconworks:before {