Revert "HC returns 500 only with TIMEOUT or FAILED"

This reverts commit 075144dc105cfe9cb5fc298efd8f8d1f5eed3670.

Reason for revert: Problem was fixed already
on stable-2.15. Merging that branch instead.

Change-Id: I17fbe4ccb1c8ec1bfd8ad64463ce6a6425be9dd5

src/main/java/com/googlesource/gerrit/plugins/healthcheck/api/HealthCheckStatusEndpoint.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/healthcheck/api/HealthCheckStatusEndpoint.java b/src/main/java/com/googlesource/gerrit/plugins/healthcheck/api/HealthCheckStatusEndpoint.java
index c508222..26a2042 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/healthcheck/api/HealthCheckStatusEndpoint.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/healthcheck/api/HealthCheckStatusEndpoint.java
@@ -51,7 +51,7 @@
         .filter(
             res ->
                 res instanceof HealthCheck.StatusSummary
-                    && ((HealthCheck.StatusSummary) res).isFailure())
+                    && ((HealthCheck.StatusSummary) res).result != HealthCheck.Result.PASSED)
         .findFirst()
         .isPresent()) {
       return HttpServletResponse.SC_INTERNAL_SERVER_ERROR;