Fixed issue [TNEXT-2869]

Fixed issue [TNEXT-2869]

The scroller view of the image tab overlapped entire screen.
Because of the overlapped scroller view, the bottom area,
which includes various controllers such as buttons and combo box,
is not able to get the focus or the events from the user.

This patch resizes the height of the scroller in the image tab.
After applying this patch, the bottom area will get the user events
like the other tabs.

Reference: http://suprem.sec.samsung.net/jira/browse/TNEXT-2869

Change-Id: I9141ff02bc5266bea00ea43a8bf2241d02059741
Signed-off-by: Sung-jae Park <nicesj@nicesj.com>