[FIX] sap.m.MultiComboBox: Editable state was not rendered initially

- Re-applying the state onBeforeRendering solves that problem.

(cherry picked from commit 411e06055ce1e9257207b279dc31fbe38496295a)

Change-Id: I924b28d046b22016ad601245c2ed0016be9cec9e
BCP: 1472010633
CR-Id: 012006153200015466242014
Merge "[FIX] sap.m.MultiComboBox: Editable state was not rendered initially" into rel-1.26