(bug 45505) Removing isSaveDisabled() from claimview

Since there should be no specific toolbar interactions in claimview anymore,
saveDisabled() does not belong there. Its purpose got already replaced by
isValid(). This change fixes "enter" key handling when saving a claim.

Change-Id: I2069762ab47dd0d8fcebd922e1e3cce32684fd0d
Merge "(bug 45505) Removing isSaveDisabled() from claimview"