feat: 优化代码

app/src/main/java/io/legado/app/ui/config/FileAssociationViewModel.kt

@@ -38,21 +38,17 @@ class FileAssociationViewModel(application: Application) : BaseViewModel(applica
                         LocalBook.importFile(uri.path.toString())
                         toast("添加本地文件成功${uri.path}")
                     }
-
                     return null
                 }
-                }
+            } else {
-                else{
                 toast("文件不存在")
                 return null
             }
 
             url = "yuedu://${scheme}/importonline?src=${uri.path}"
-            }
+        } else if (uri.scheme == "yuedu") {
-            else if (uri.scheme == "yuedu"){
             url = uri.toString()
-            }
+        } else {
-            else{
             url = "yuedu://booksource/importonline?src=${uri.path}"
         }
         val data = Uri.parse(url)