Signals: Don't pass default binds to EditorProperty property_changed

This was done by mistake in #36758, but it's not necessary and actual
causes a bug.

`property_changed` is only emitted via `emit_changed()`, which already
has default values for `p_field` and `p_changing`.

Also reverted to using `String` for now to be on the safe side, even if
it's inconsistent with `emit_changed()`. I had only changed it
partially in #36758 so it was inconsistent. It probably does make sense
to port `EditorInspector` and related property editors to use
`StringName` where relevant, but that's for a dedicated PR.

Fixes #36799.

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