[INTERNAL][FIX] sap.m.ActionSheet: Fix width issue

When the border is set to 0.125rem the width of the
action sheet popover is not calculated correctly which
causes a scrollbar to appear in IE.

Change-Id: Ie263ab7414c98cff7930427e179ce4b0988a96d6
Signed-off-by: Deyan Yanakiev <deyan.yanakiev@sap.com>
CR-Id: 012003146900008975612014
(cherry picked from commit 53c722daf36af3fb189f99886090136df6c97546)
Merge "[INTERNAL][FIX] sap.m.ActionSheet: Fix width issue" into rel-1.26