:bug: Increase max text length for controller text setting

[ion098]

Summary:

Changes max length of controller text to 31 characters.

Motivation:

VEXCode allows users to set controller text with a maximum length of 31 characters, but PROS caps controller text at 15 characters.

References (optional):

Close #679

Test Plan:

• [ ] Check it compiles
• [ ] Check that controller text setting works with strings up to 31 characters long
• [ ] Check that this doesn't break controller text clearing

[noam987]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[BennyBot]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[liucougar]

this would be nice to have