edc_editor: Fix to set edc changed in edit_text_insert().

Set edc changed in edit_text_insert() to save text insertion.

Test Plan:
1. open find/replace (ctrl + f)
2. write strings in "Find:" and "Replace with:"
3. push "Replace all"
4. close edc

When edc is closed without saving after replacing a string, warning
popup should appear.

src/lib/edc_editor.c

@@ -865,6 +865,8 @@ edit_text_insert(edit_data *ed, const char *text)
    evas_textblock_cursor_pos_set(cur, old_pos);
 
    elm_entry_calc_force(ed->en_edit);
+
+   edit_changed_set(ed, EINA_TRUE);
    free(selection_utf8);
 }