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/spec/javascripts/sqllab/QueryStateLabel_spec.jsx

@@ -13,11 +13,6 @@ describe('SavedQuery', () => {
     },
   };
   it('is valid', () => {
-    expect(
-      React.isValidElement(<QueryStateLabel />),
-    ).to.equal(true);
-  });
-  it('is valid with props', () => {
     expect(
       React.isValidElement(<QueryStateLabel {...mockedProps} />),
     ).to.equal(true);