feat: 优化代码

app/src/main/java/io/legado/app/data/dao/ReplaceRuleDao.kt

@@ -34,13 +34,13 @@ interface ReplaceRuleDao {
 
     @Query(
         """SELECT * FROM replace_rules WHERE isEnabled = 1 
-        AND (scope LIKE '%' || :scope || '%' or scope = null or scope = '')"""
+        AND (scope LIKE '%' || :scope || '%' or scope is null or scope = '')"""
     )
     fun findEnabledByScope(scope: String): List<ReplaceRule>
 
     @Query(
         """SELECT * FROM replace_rules WHERE isEnabled = 1 
-        AND (scope LIKE '%' || :name || '%' or scope LIKE '%' || :origin || '%' or scope = null or scope = '')"""
+        AND (scope LIKE '%' || :name || '%' or scope LIKE '%' || :origin || '%' or scope is null or scope = '')"""
     )
     fun findEnabledByScope(name: String, origin: String): List<ReplaceRule>