Effects of the Subplantar Administration of Morphine (100 µg), DPDPE (100 μg), or JWH-015 (30 μg) Alone or Combined with CTAP (120 μg) or NX-ME (20 μg), Naltrindole (50 μg), or NX-ME (20 μg), and AM630 (30 μg) or AM251 (150 μg), Respectively, on the Mechanical Allodynia, Thermal Hyperalgesia, and Thermal Allodynia Induced by Injury in the Ipsilateral Paw of Sciatic Nerve-injured Animals