Fixing some warnings during tests (#3648)

* ColorSchemeControl: fixing bad use of PropTypes

Accessing PropTypes via the main React package is deprecated, and will be
removed in React v16.0. Use the latest available v15.* prop-types package from
npm instead. For info on usage, compatibility, migration and more, see
https://fb.me/prop-types-docs

* Control: adding PropTypes.func in types allowed inside `value` prop

This removes a warning during yarn tests

Fix #3589

* tests(QueryStateLabel): removing missing prop warning

```
Warning: Failed prop type: The prop `query` is marked as required in
`QueryStateLabel`, but its value is `undefined`.
    in QueryStateLabel
```

* SaveQuery: removing invalid prop `target` supplied to `Overlay`.

This removes a warning during yarn tests:

```
Warning: Failed prop type: Invalid prop `target` supplied to `Overlay`.
```

* RunQueryActionButton: removing `isRequired` from queryState props

This removes a warning during yarn tests:
```
Warning: Failed prop type: The prop `queryState` is marked as required in
`RunQueryActionButton`, but its value is `null`.
```

superset/assets/javascripts/SqlLab/components/SaveQuery.jsx

@@ -112,7 +112,6 @@ class SaveQuery extends React.PureComponent {
       <span className="SaveQuery">
         <Overlay
           trigger="click"
-          target={this.state.target}
           show={this.state.showSave}
           placement="bottom"
           animation={this.props.animation}