LockScreen: always request focus when clicking on text field

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Tests: Add an InverseMouseArea, which is not perfect but sufficient for testing

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Merge pull request #142 from webOS-ports/tofe/fixes

Tofe/fixes