[openstreetmap/openstreetmap-website] Trim username/e-mail whitespace in login page (Issue #4471)

[zstadler]

### Problem

OSM users are redirected to OSM login for authentication. We continuously receive complaints about users unable to access their accounts.

95% of the user issues are due to extra space added to the OSM username/email that is added by many mobile keyboards with auto-completion. Users do not notice that extra space and their login fails

### Description

The requested solution to the problem is to trim leading and trailing whitespace. It is a safe change since leading and trailing whitespace characters are not permitted as OSM usernames or an e-mail address

### Screenshots

The error produced when a space character is appended to the username, as done by many mobile keyboards with auto-completion

![image](https://github.com/openstreetmap/openstreetmap-website/assets/1304610/66999f36-6b57-4e02-a286-cd4e213856cf)


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