Increase test coverage

[digitalghost-dev]

There are several functions that are currently at 0.0% coverage:

Validation Functions (in cmd/utils/validateargs_test.go):

1. ValidateBerryArgs - TestValidateBerryArgs
2. ValidateItemArgs - TestValidateItemArgs
3. ValidateMoveArgs - TestValidateMoveArgs
4. ValidateSpeedArgs - TestValidateSpeedArgs

Styling Functions (in styling/styling_test.go):

5. FormTheme - TestFormTheme