[Regression] Make scrolling work with mouse events support

[Regression] Make scrolling work with mouse events support

https://review.tizen.org/gerrit/#/c/10703/
The above patch allows to enable mouse events by default, but it causes
disabling scrolling on the webview because the webview(evas object) consumes
all the mouse events and does not forward those events to the gesture recognizer.

This patch enables mouse events in the gesture recognizer, which allows
scrolling and mouse events to work together.

Change-Id: I69f3e09957c6e9e9313de03da4b58f6e6840d1fe