fix: abnormal hyperlink (#189)

修复在某种选中模式下，超链接格式逆位

src/views/CodemirrorEditor.vue

@@ -465,12 +465,14 @@ export default {
           start = anchor
           end = head
         }
-      } else if (head.line < anchor.line) {
+      } else {
+        if (head.line < anchor.line) {
           start = head
           end = anchor
         } else {
-        start = head
-        end = anchor
+          start = anchor
+          end = head
+        }
       }
 
       const rows = []