[Fix] `set -e`: `nvm install lts/something`: call `nvm_ensure_default_set` with the proper value.

Fixes #1394.

nvm.sh

@@ -2460,7 +2460,11 @@ nvm() {
       fi
 
       if [ "$NVM_INSTALL_SUCCESS" = true ] && nvm use "$VERSION"; then
-        nvm_ensure_default_set "$provided_version"
+        if [ -n "${LTS-}" ]; then
+          nvm_ensure_default_set "lts/${LTS}"
+        else
+          nvm_ensure_default_set "$provided_version"
+        fi
         if [ ! -z "$REINSTALL_PACKAGES_FROM" ] \
           && [ "_$REINSTALL_PACKAGES_FROM" != "_N/A" ]; then
           nvm reinstall-packages "$REINSTALL_PACKAGES_FROM"

test/installation_node/install LTS

@@ -24,8 +24,6 @@ EXPECTED_OUTPUT="Version '3' (with LTS filter 'argon') not found - try \`nvm ls-
 [ "${EXIT_CODE}" = 3 ] || die "\`nvm install --lts=argon 3\` did not exit with 3, got >${EXIT_CODE}<"
 [ "${OUTPUT}" = "${EXPECTED_OUTPUT}" ] || die "\`nvm install --lts=argon 3\` output >${OUTPUT}<, expected >${EXPECTED_OUTPUT}<"
 
-set +e # TODO: fix
 nvm install --lts 4.2.2 || die 'nvm install --lts 4.2.2 failed'
-set -e
 
 [ "$(nvm current)" = "v4.2.2" ] || die "v4.2.2 not current, got $(nvm_current)"