template: Fix to set edc changed in template_insert().

Set edc changed in template_insert() to save template insertion.

Test Plan:
1. write a part. (e.g. rect { "rect2";)
2. insert desc template (ctrl + t)
2. close edc

When edc is closed without saving after inserting template, warning
popup should appear.

src/lib/template.c

@@ -401,6 +401,7 @@ template_insert(edit_data *ed, Enventor_Template_Insert_Type insert_type,
    elm_entry_cursor_pos_set(entry, cursor_pos);
 
    edit_syntax_color_partial_apply(ed, 0);
+   edit_changed_set(ed, EINA_TRUE);
 
    ret = EINA_TRUE;