Avoid circular dependency in reducers with appState

[bsclifton]

Discovered while testing 0.15.0 (on dev-channel) after bc6fda7 was pulled in

error seen is:

> [email protected] start /Users/clifton/Documents/browser-laptop
> node ./tools/start.js --user-data-dir=brave-development --enable-logging --v=0 --enable-extension-activity-logging --enable-sandbox-logging --enable-dcheck

Crash reporting enabled
2017-04-21 15:15:39.187 Brave Helper[23589:933658] Couldn't set selectedTextBackgroundColor from default ()
An uncaught exception occurred in the main process Uncaught Exception:
TypeError: AppStore.getState is not a function
    at EventEmitter.ipcMain.on (/Users/clifton/Documents/browser-laptop/app/browser/reducers/passwordManagerReducer.js:104:32)
    at emitThree (events.js:116:13)
    at EventEmitter.emit (events.js:194:7)
    at WebContents.<anonymous> (/Users/clifton/Documents/browser-laptop/node_modules/electron-prebuilt/dist/Brave.app/Contents/Resources/electron.asar/browser/api/web-contents.js:182:13)
    at emitTwo (events.js:106:13)
    at WebContents.emit (events.js:191:7)