fix ControlHOC ref for redux container widgets

[erquhart]

If a widget uses connect to receive state updates from the store, ControlHOC can no longer get the control instance ref. This fix checks for this case and uses a connect option to obtain the wrapped control ref.

[eliwilliamson]

@erquhart are you sure this is fixed? it seems to persist for me in 0.7.3. - still getting the following error:

ControlHOC.js:110 Uncaught TypeError: r.wrappedControlValid is not a function
    at t.r.validateWrappedControl (ControlHOC.js:110)
    at Object.r.validate [as sidebarlinks] (ControlHOC.js:71)
    at ControlPane.js:22
    at Me.__iterate (immutable.js:2206)
    at Me.forEach (immutable.js:4381)
    at t.o.validate (ControlPane.js:20)
    at r.handleOnPersist (EntryEditor.js:32)
    at Object.g (react-dom.production.min.js:36)
    at Object.invokeGuardedCallback (react-dom.production.min.js:35)
    at Object.invokeGuardedCallbackAndCatchFirstError (react-dom.production.min.js:35)

[erquhart]

@eliwilliamson just seeing this - can you provide repro steps?