Install script should abort on network failure

### [REQUIRED] Environment info

**Platform:** Ubuntu 20.04

### [REQUIRED] Test case

Running the install script on a mobile network. When the curl failed, the install script continued and asked for the sudo password. After rejecting the sudo-promt (Ctrl+C) the script also continued.

```
> curl -sL https://firebase.tools | bash
-- Checking for existing firebase-tools...
-- Checking your machine type...
-- Downloading binary from https://firebase.tools/bin/linux/latest
######################################################################## 100.0%##O=# #
################################## 47.7%curl: (18) transfer closed with 126580227 bytes remaining to read

[sudo] password for ******:
[sudo] password for ******:
-- Setting permissions on binary... /usr/local/bin/firebase
[sudo] password for ******:
bash: line 279: /usr/local/bin/firebase: No such file or directory
Something went wrong, firebase has not been installed.
Please file a bug with your system information on Github.
https://github.com/firebase/firebase-tools/
-- All done!
```

### [REQUIRED] Expected behavior

The script should abort on errors

### [REQUIRED] Actual behavior

The script continues through all errors