Fix PermissionDeniedException.message

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/contact/MemberImpl.kt

@@ -200,7 +200,7 @@ internal class MemberImpl constructor(
     private fun checkBotPermissionHigherThanThis(operationName: String) {
         check(group.botPermission > this.permission) {
             throw PermissionDeniedException(
-                "`$operationName` operation requires a higher permission, while" +
+                "`$operationName` operation requires a higher permission, while " +
                         "${group.botPermission} < ${this.permission}"
             )
         }