[Fleet]: Unenrolled status label color is not same as available in …

…status bar under Agents tab. (#150258)

[Fleet]: Unenrolled status label color is not same as available in
status bar under Agents tab

Resolves #149661

### Loom/Screenshot Demo
* **How to reproduce the issue:**
https://www.loom.com/share/fe09755fd3954bdb974e6523c9bd21de
* **Fix:** https://www.loom.com/share/a73131aa16b949d690cc984418715b52

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_health.tsx

@@ -37,7 +37,7 @@ const Status = {
     </EuiBadge>
   ),
   Unenrolled: (
-    <EuiBadge color="hollow">
+    <EuiBadge color={euiVars.euiColorDisabled}>
       <FormattedMessage
         id="xpack.fleet.agentHealth.unenrolledStatusText"
         defaultMessage="Unenrolled"