Fix text scroll start position issue

When user sets textlabel auto scroll, it starts after aligning.
It makes long text start its scrolling at the odd position when
horizontal alignment is not begin.

Makes long text always start its scrolling at the begin position even if
horizontal alignment is set.

Change-Id: I3d3e93dd7c8bf4925ccfdef083ab0c7ac5c44523
Signed-off-by: minho.sun <minho.sun@samsung.com>