um-editable-button: avoid using deprecated GtkAlignment and GtkMisc

https://bugzilla.gnome.org/show_bug.cgi?id=736013
um-editable-combo: avoid using deprecated GtkAlignment and GtkMisc

https://bugzilla.gnome.org/show_bug.cgi?id=736013
cc-editable-entry: avoid using deprecated GtkAlignment and GtkMisc

https://bugzilla.gnome.org/show_bug.cgi?id=736013
mouse: avoid using deprecated GtkAlignment and GtkMisc

https://bugzilla.gnome.org/show_bug.cgi?id=736013