return change to sender not enabled by default

Enabled via GUI checkbox on sendcoinsdialogg
celestial theme: fix invisible scrollbar handle
coincontrol: widen the window a bit

It avoids the horizontal scrollbar now that a new column was added
Merge pull request #28 from moneromooo/celestial-scrollbar

celestial theme: fix invisible scrollbar handle
Merge pull request #29 from moneromooo/ccwidth

coincontrol: widen the window a bit
Merge remote-tracking branch 'upstream/master'