Add shortcutsOverride in QLineEdit for used shortcuts

QLineEdit uses shortcuts to QKeySequence::DeleteCompleteLine and
QKeySequence::MoveToEndOfLine

These shortcuts were not in the overrideShortcuts which can
cause erratic behavior.

Change-Id: I69e2b00e38d3f0e48a20f91f08a22b3fae9b7c48
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>