[Fix] specify 'origin' remote name with git clone ... installs

`git` may be configured locally to use a non-'origin' default remote name.
So, specify 'origin' as the remote name when cloning to get the expected setup.

install.sh

@@ -163,7 +163,7 @@ install_nvm_from_git() {
       }
     else
       # Cloning repo
-      command git clone "$(nvm_source)" --depth=1 "${INSTALL_DIR}" || {
+      command git clone "$(nvm_source)" --depth=1 --origin=origin "${INSTALL_DIR}" || {
         nvm_echo >&2 'Failed to clone nvm repo. Please report this!'
         exit 2
       }