Go button shrinks if strings are non-dynamically short

[KatieWoe]

Device
iPad 10th gen
OS
iPadOS 18.1.1
Browser
Safari
Problem Description
For phetsims/qa#1184
The Go button on the first screen gets smaller if strings are short non-dynamically, such as with stringTest=X. May not be worth addressing.
Visuals

[KatieWoe]

Note: This is the same as in published