isUpdating remains true if backgroundReloadAll is false

[wongpeiyi]

See http://emberjs.jsbin.com/xicosasazo/1/edit?html,js,output – click "Click here", then "Go back" –> isUpdating is true even though backgroundReloadAll returns false and no fetch was triggered

Should

data/addon/-private/system/store.js

Line 1378 in 03d098d

set(array, 'isUpdating', true);

reset isUpdating to false before returning?

[bmac]

Closed by #4529