android: fix severity sorting (#791)

The previous fix attempt resulted in comparing other.Severity to itself, which always returns 0. This compares the other item's severity to this item's severity.

Updates tailscale/corp#41733

Signed-off-by: kari-ts <kari@tailscale.com>

Author: kari-ts

android/src/main/java/com/tailscale/ipn/ui/model/Health.kt

@@ -36,7 +36,7 @@ class Health {
 
     override fun compareTo(other: UnhealthyState): Int {
       // Compare by severity first
-      val severityComparison = other.Severity.compareTo(other.Severity)
+      val severityComparison = other.Severity.compareTo(Severity)
       if (severityComparison != 0) {
         return severityComparison
       }