edje: Fix coverity warning

edje: Fix coverity warning

CID 1355234 Logically dead code

The indicated dead code may have performed some action;
that action will never occur.
In eet_data_descriptor_element_add: Code can never be
reached because of a logical contradiction (CWE-561)

Solution: use explicit range within valid values with <= and >=
rather than excluded values with > and <