[Test] "nvm alias" lts test bug fix

test/fast/Aliases/lts/"nvm alias" should ensure LTS alias dir exists

@@ -7,6 +7,8 @@ set -ex
 
 LTS_ALIAS_PATH="$(nvm_alias_path)/lts"
 
+rm -rf "${LTS_ALIAS_PATH}"
+
 die () { echo "$@" ; exit 1; }
 
 [ ! -d "${LTS_ALIAS_PATH}" ] || die "'${LTS_ALIAS_PATH}' exists and should not"