[Tizen] Fix coding style error
[Tizen] Change MouseDown method

Mouse down event in Elementary Plug don't send it's coordinates, it gets
from the last mouse move. We changed the MouseDown method to trigger the
MouseMove method before.

The dropdown in TizenSystemIndicator landscape mode needs the
last coordinates to succeed.
Merge pull request #1403 from ricardotk/indicator

[Tizen] Change MouseDown method