MM-61450 fix errcheck issue in server/channel/app/permissions_test.go (#31132)

server/.golangci.yml

@@ -111,7 +111,6 @@ linters:
           channels/app/bot_test.go|\
           channels/app/file_test.go|\
           channels/app/helper_test.go|\
-          channels/app/permissions_test.go|\
           channels/app/platform/helper_test.go|\
           channels/store/localcachelayer/channel_layer.go|\
           channels/store/localcachelayer/channel_layer_test.go|\
@@ -243,4 +242,4 @@ formatters:
       - mock.*
 issues:
   max-issues-per-linter: 0 # no maximum
-  max-same-issues: 0 # no maximum
+  max-same-issues: 0 # no maximum