Molecular Docking Studies of N-(((5-Aryl-1,3,4-oxadiazol-2-yl)amino)methyl)- and N-(2,2,2-Trichloro-1-((5-aryl-1,3,4-oxadiazol-2-yl)amino)ethyl)carboxamides as Potential Inhibitors of GSK-3β