[FIX] sap.m.Panel: Heigh not calculated properly

Downport of change I0c8ae428b5cccfc69fa4232e22203b724590e389.
Plus change Id677ef3693e152f46e776ef19a62da5c081c8412.

Change-Id: Ied61e57f33836186831c27a1269e05f968b10241
BCP: 1472013766
CR-Id: 012006153200015419342014
Signed-off-by: Deyan Yanakiev <deyan.yanakiev@sap.com>
Merge "[FIX] sap.m.Panel: Heigh not calculated properly" into rel-1.26