[FIX] sap.m.Popover: Broken content height fixed
[FIX] sap.m.Popover: Broken content height fixed

The content area is not visible when the user
resizes the window to a small resolution.

BCP: 1970572660
Change-Id: I1dfc82433781216326d6bd9a65f4b13fdf263279

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5