Fix double PR notification from API (#10482)

Signed-off-by: jolheiser <john.olheiser@gmail.com>

routers/api/v1/repo/pull.go

@@ -16,7 +16,6 @@ import (
 	"code.gitea.io/gitea/modules/convert"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/notification"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/routers/api/v1/utils"
@@ -326,8 +325,6 @@ func CreatePullRequest(ctx *context.APIContext, form api.CreatePullRequestOption
 		return
 	}
 
-	notification.NotifyNewPullRequest(pr)
-
 	log.Trace("Pull request created: %d/%d", repo.ID, prIssue.ID)
 	ctx.JSON(http.StatusCreated, convert.ToAPIPullRequest(pr))
 }