Make username case insensitive on Privacy Grant page

pkg/controller/photo/private.go

@@ -3,6 +3,7 @@ package photo
 import (
 	"fmt"
 	"net/http"
+	"strings"
 
 	"code.nonshy.com/nonshy/website/pkg/config"
 	"code.nonshy.com/nonshy/website/pkg/log"
@@ -61,7 +62,7 @@ func Share() http.HandlerFunc {
 		// To whom?
 		var (
 			user        *models.User
-			username    = r.FormValue("to")
+			username    = strings.TrimSpace(strings.ToLower(r.FormValue("to")))
 			isRevokeAll = r.FormValue("intent") == "revoke-all"
 		)