Do not reset URI path for Checks API

Fixes issue JENKINS-63887.

Author: Alexander Ost

src/main/java/com/google/gerrit/plugins/checks/client/Checks.java

@@ -161,7 +161,7 @@ private URI buildRequestUrl(String suffixPath) throws URISyntaxException {
         .setPath(
             String.format(
                 "%schanges/%d/revisions/%d/checks/%s",
-                getPrefix(), changeNumber, patchSetNumber, suffixPath))
+                uriBuilder.getPath() + getPrefix(), changeNumber, patchSetNumber, suffixPath))
         .build();
   }
 }