NH-3900 - Fix restore syntax for NUnit.Console (to squash)

Author: hazzik

build-common/common-project.xml

@@ -58,7 +58,9 @@
 			<arg value="NHibernate.sln" />
 		</exec>
 		<exec basedir="${tools.dir}" workingdir="${root.dir}/Tools" program="NuGet.exe">
-			<arg value="install" />
+			<arg value="restore" />
+			<arg value="-PackagesDirectory" />
+			<arg value="." />
 		</exec>
 	</target>