update node10 test to reflect the removal of conda nodejs

tests/base/node10/verify

@@ -1,13 +1,11 @@
 #!/bin/sh
 
-set -e
+set -ex
-# check node from conda-forge
+
+# check node system package and its version
 which node
 node --version
-node --version | grep v11
+node --version | grep v10
-# check node system package
-/usr/bin/node --version
-/usr/bin/node --version | grep v10
 
 which npm
 npm --version