elementary textpath: update Evas map when text is updated

Summary:
Evas map was not updated when text was updated.
@fix

Test Plan:
1. Run the following test case.
  elementary_test -to "efl.ui.textpath"
2. Toggle short text.
3. See a long line from the end of text which is wrong.
  If you change angle, Evas map will be updated properly.
  But, it should be updated when text is updated.

Reviewers: raster, cedric, thiepha, Hermet

Reviewed By: Hermet

Subscribers: Hermet, #committers, zmike

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6216

src/lib/elementary/efl_ui_textpath.c

@@ -570,6 +570,7 @@ _textpath_text_set_internal(Eo *obj, Efl_Ui_Textpath_Data *pd, const char *part,
    if (!text) text = "";
    ret = edje_object_part_text_set(pd->text_obj, part, text);
    _ellipsis_set(pd);
+   _sizing_eval(pd);
 
    return ret;
 }