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Fix rule builder input with integer values
Upload a dataset with the only content being
`123`. Go to the upload module, select the `Rule-based` tab.
Select `Load tabular data from: `History Dataset` and select
the dataset you just uploaded. Without this fix you'd see
```
vue.runtime.esm.js?2b0e:1897 TypeError: selection.content.split is not a function
at createCollectionViaRules (RuleBasedCollectionCreatorModal.js?46f9:63:1)
at child.buildCollection (history-view-edit.js?0c85:387:1)
at VueComponent._buildSelection (RulesInput.vue?5e16:199:1)
at VueComponent._eventBuild (RulesInput.vue?5e16:164:1)
at invokeWithErrorHandling (vue.runtime.esm.js?2b0e:1863:1)
at HTMLButtonElement.invoker (vue.runtime.esm.js?2b0e:2184:1)
at original._wrapper (vue.runtime.esm.js?2b0e:6961:1)
```
That because `selection.content` is an integer value.