Disambiguation popup should send tap gestures not mouse events

Disambiguation popup should send tap gestures not mouse events

When disambiguation popup is shown, and user clicks on its
content, RWHVEfl synthesizes and sends mouse down/up events
to the renderer.
Mouse events are different from a regular touch input, and various
touch-oriented features are not triggered:
- zoom to focused editable node;
- insert large handle on tap.

Patch switches from the disambiguation popup handling logic
from synthesized mouse events to tap gestures.

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=15359

Reviewed by: a1.gomes, g.czajkowski

Change-Id: I291e107634c4cc56c8512705bcf05ecbcfd81f19
Signed-off-by: Antonio Gomes <a1.gomes@samsung.com>