perf: improve the logic of input selection for category and tag (#3978)

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#### What type of PR is this?
/kind improvement
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#### What this PR does / why we need it:

改善分类和标签选择性输入框的输入逻辑

![Kapture 2023-05-22 at 01 20 41](https://github.com/halo-dev/halo/assets/106857035/cf2d60f5-9ec5-4e5c-99e2-e3cd7a97d692)


#### Which issue(s) this PR fixes:

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Fixes #3959

#### Special notes for your reviewer:

#### Does this PR introduce a user-facing change?

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NONE
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console/src/formkit/inputs/category-select/CategorySelect.vue

@@ -129,6 +129,7 @@ const handleSelect = (category: CategoryTree | Category) => {
       );
     } else {
       props.context.node.input([...currentValue, category.metadata.name]);
+      text.value = "";
     }
     return;
   }

console/src/formkit/inputs/tag-select/TagSelect.vue

@@ -119,6 +119,7 @@ const handleSelect = (tag: Tag) => {
       );
     } else {
       props.context.node.input([...currentValue, tag.metadata.name]);
+      text.value = "";
     }
     return;
   }