Make login form button more mobile friendly

[Ninjaclasher]

By submitting this pull request, I confirm the following:

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)
• I have Signed Off all commits. (git commit --signoff)

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What does this PR aim to accomplish?:

Currently, the login actions, "Log in" and "Remember me for 7 days" are squished to the right for a small width screen. Example:

This PR moves the "Remember me for 7 days" to the left of the "Log in" button and attaches it to the left of the container.

How does this PR accomplish the above?:

The pull-right is changed to a pull-left. This only affects screens where the keyboard shortcuts are hidden.

After changes on a small width screen:

After changes on a very small width screen:

After changes on a normal screen: (identical to what it looked like before)

What documentation changes (if any) are needed to support this PR?:

No documentation changes should be required. I couldn't find any screenshots of the login page on a small width screen, so I don't think any screenshots need updating.

[DL6ER]

Thanks!

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-core-web-v5-2-and-ftl-v5-3-released/40909/1