Show last odometer value as placeholder when creating new fuel record

[Forceu]

This PR adds a JS function, which sets the last odometer as a placeholder to the odometer input field when creating a new fuel record.
I find myself always clicking the + button to increase the last odometer by 1, so that I have the last odometer record when entring the data. This might PR be quite helpful for some people

[hargata]

so I gave this some thought, would this perhaps be a better solution?

So this will display the current odometer when the user clicks on the "+" button, and it will now also allow for 0 increments to use the current odometer.

[Forceu]

Although this would work as well, in my case it wouldn't really make a difference if I enter a 0 or 1 in the odometer field. Having the last odometer in the regular input UI is to make sure that I wrote it down correctly (or if it was an older car with high mileage, it would be enough to remember the last three digits).

In the end I know that not everyone needs such a feature, I simply implemented it because it saved me some clicks.