Default UA input length on Admin form

This is a minor issue, but I though it may add a little bit of convenience to the module for GA users who have longer UA id's.

If you notice right now there is just enough space for one digit after the hyphen. The hyphen indicates the sequence the GA property was created. For example, if you have created 10 GA properties then your most recent property created would end in -10.

Right now the last digit is cut off from view if you have created 10 or more Google properties. In the photo the last digit is cut off.

This makes it not only aesthetically displeasing for users who have many GA properties but hides otherwise useful information from the GA admin. You have to focus the cursor on the input and then hit the right scroll key to get to the last digits.