Turn focalboard plugin on by default (#18132)

* turn focalboard plugin on by default

* cleanup

* update config diff tests to add new default

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

config/diff_test.go

@@ -339,6 +339,9 @@ func TestDiff(t *testing.T) {
 						"com.mattermost.nps": {
 							Enable: !defaultConfigGen().PluginSettings.PluginStates["com.mattermost.nps"].Enable,
 						},
+						"focalboard": {
+							Enable: true,
+						},
 						"playbooks": {
 							Enable: true,
 						},
@@ -368,6 +371,9 @@ func TestDiff(t *testing.T) {
 						"com.mattermost.newplugin": {
 							Enable: true,
 						},
+						"focalboard": {
+							Enable: true,
+						},
 						"playbooks": {
 							Enable: true,
 						},
@@ -389,6 +395,9 @@ func TestDiff(t *testing.T) {
 					Path:    "PluginSettings.PluginStates",
 					BaseVal: defaultConfigGen().PluginSettings.PluginStates,
 					ActualVal: map[string]*model.PluginState{
+						"focalboard": {
+							Enable: true,
+						},
 						"playbooks": {
 							Enable: true,
 						},