Remove forwarding shift key events and fix keycode conversion.

Remove forwarding shift key events and fix keycode conversion.

[Requirement] WCS TC 90

There was unnecessary shift key event forwarding what causes
wrong events dispatching.

Now after press "A" letter, events are:

keydown
keydown
keypress
composition-end
input
keyup
keyup

but it should be:

keydown
keypress
composition-end
input
keyup

This patch fix this.

Added conversion of keycode.

Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=10687
Reviewed by: Antonio Gomes, Piotr Grad

Change-Id: I892c065edc7490ee66425787d59a6596a4adc0d4
Signed-off-by: Karol Furmaniak <k.furmaniak@samsung.com>