Fix testcase (#127)

Author: ota-meshi

test/fixtures/ast/filters-opt-filter-off-babel/ast.json

@@ -10,8 +10,7 @@
         "end": {
             "line": 1,
             "column": 0
-        },
-        "filename": "source.vue"
+        }
     },
     "range": [
         0,
@@ -145,8 +144,7 @@
                                 "end": {
                                     "line": 2,
                                     "column": 22
-                                },
-                                "filename": "source.vue"
+                                }
                             },
                             "range": [
                                 23,
@@ -164,8 +162,7 @@
                                     "end": {
                                         "line": 2,
                                         "column": 15
-                                    },
-                                    "filename": "source.vue"
+                                    }
                                 },
                                 "range": [
                                     23,
@@ -186,8 +183,7 @@
                                     "end": {
                                         "line": 2,
                                         "column": 22
-                                    },
-                                    "filename": "source.vue"
+                                    }
                                 },
                                 "range": [
                                     30,
@@ -210,8 +206,7 @@
                                         "end": {
                                             "line": 2,
                                             "column": 15
-                                        },
-                                        "filename": "source.vue"
+                                        }
                                     },
                                     "range": [
                                         23,
@@ -234,8 +229,7 @@
                                         "end": {
                                             "line": 2,
                                             "column": 22
-                                        },
-                                        "filename": "source.vue"
+                                        }
                                     },
                                     "range": [
                                         30,