fix: inputTable组件中嵌套picker时数据域更新问题

[huangxj29]

描述问题：
inputTable组件中嵌套picker，picker 组件设置 "joinValues": false 时，用户选择picker组件内容后删除，然后选择新加行，原来删除的内容会重新回显

如何复现（请务必完整填写下面内容）：
{ "type": "page", "body": { "type": "form", "debug": "true", "data": { "table": [ { "a": "a1", "b": "b1", } ] }, "api": "/api/mock2/form/saveForm", "body": [ { "type": "input-table", "name": "table", "addable": true, "columns": [ { "name": "a", "label": "A" }, { "name": "b", "label": "B" }, { "type": "picker", "name": "picker", "needConfirm": false, "joinValues": false, "options": [ { "label": "A", "value": "a" }, { "label": "B", "value": "b" }, { "label": "C", "value": "c" } ], }, ] } ] } }

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[lurunze1226]

麻烦补充一下单测场景呢