Use checked state of checkbox instead of its value

[achim-t]

The value of a checkbox is always empty therefore the query string wouldn't include the value for full_time. We have to use the checked state instead.

(The API only filters for full_time=true, otherwise no filtering is happening. So requesting positions with full_time=false will return full time jobs as well.)

[webcrafters]

Correct :)

[bdmessenger]

const handleParamChange = e => {
    const param = e.target.name
    const value = param === "full_time" ? e.target.checked : e.target.value
    setPage(1)
    setParams(previousParams => {
      return {...previousParams, [param]: value}
    })
}