fix dicts typo (#718)

public/dicts/IELTSVocabularyBible.json

@@ -18144,7 +18144,7 @@
         "usphone": "[əˈnɑːnɪməs]"
     },
     {
-        "name": false,
+        "name": "false",
         "trans": [
             "adj. 错误的；虚伪的；伪造的 adv. 欺诈地"
         ],

public/dicts/IELTS_order.json

@@ -56328,7 +56328,7 @@
         "usphone": "zoʊˈɑləʤi"
     },
     {
-        "name": null,
+        "name": "null",
         "trans": ["adj.无效力的, 无效的, 无价值的, 等于零的。n.零, 空, 零迅号"],
         "ukphone": "nʌl",
         "usphone": "nʌl"

public/dicts/Top250AdverbWords.json

@@ -1586,7 +1586,7 @@
         "ukphone": "'louər"
     },
     {
-        "name": true,
+        "name": "true",
         "trans": [
             "In accordance with fact or reality."
         ]
@@ -1872,7 +1872,7 @@
         "ukphone": "smuːð"
     },
     {
-        "name": false,
+        "name": "false",
         "trans": [
             "Falsely means in a way that is not true or accurate."
         ]