Login: Require user to not be signed in to get request password email (#35421) (#35672)

(cherry picked from commit 7f882eea05)

Co-authored-by: Tobias Skarhed <1438972+tskarhed@users.noreply.github.com>

pkg/middleware/auth.go

@@ -161,6 +161,12 @@ func SnapshotPublicModeOrSignedIn(cfg *setting.Cfg) macaron.Handler {
 	}
 }
 
+func ReqNotSignedIn(c *models.ReqContext) {
+	if c.IsSignedIn {
+		c.Redirect(setting.AppSubUrl + "/")
+	}
+}
+
 // NoAuth creates a middleware that doesn't require any authentication.
 // If forceLogin param is set it will redirect the user to the login page.
 func NoAuth() macaron.Handler {