MM-10640 Set EnableUserCreation to true by default (#8815)

* Set EnableUserCreation to true by default

* Fix argument type to FormatBool

* Convert EnableUserCreation instances to pointer

* Convert to boolean in tests also

* Set value of pointer to be false

* Convert remaining EnableUserCreation instances to pointer

app/user.go

@@ -162,7 +162,7 @@ func (a *App) CreateUserFromSignup(user *model.User) (*model.User, *model.AppErr
 }
 
 func (a *App) IsUserSignUpAllowed() *model.AppError {
-	if !a.Config().EmailSettings.EnableSignUpWithEmail || !a.Config().TeamSettings.EnableUserCreation {
+	if !a.Config().EmailSettings.EnableSignUpWithEmail || !*a.Config().TeamSettings.EnableUserCreation {
 		err := model.NewAppError("IsUserSignUpAllowed", "api.user.create_user.signup_email_disabled.app_error", nil, "", http.StatusNotImplemented)
 		return err
 	}
@@ -250,7 +250,7 @@ func (a *App) createUser(user *model.User) (*model.User, *model.AppError) {
 }
 
 func (a *App) CreateOAuthUser(service string, userData io.Reader, teamId string) (*model.User, *model.AppError) {
-	if !a.Config().TeamSettings.EnableUserCreation {
+	if !*a.Config().TeamSettings.EnableUserCreation {
 		return nil, model.NewAppError("CreateOAuthUser", "api.user.create_user.disabled.app_error", nil, "", http.StatusNotImplemented)
 	}