entry: emit changed,user signal when text is pasted or dropped

entry: emit changed,user signal when text is pasted or dropped

Summary:
When text is pasted or dropped into entry, the "changed,user" signal
should be emitted, not "changed" signal.
Currently, the "changed" signal is emitted.
This patch fixes this issue.

@fix

Reviewers: herdsman, tasn

Subscribers: tasn

Differential Revision: https://phab.enlightenment.org/D2710