fix(protocol-designer): fix the display when dropdown menu option is only one

[koji]

Overview

fix the display when dropdown menu option is only one and update copies.
https://opentrons.slack.com/archives/C07E9T2NAQK/p1730494043739239

@jerader @ncdiehl11
As you can see there is a small gap in Volume per wells (there would be a few similar cases that use InputForm) because components/src/atoms/InputField/index.tsx
Obviously, removing padding is easy but it will have a kind of big impact on PD? (I guess there wouldn't no issue on Desktop app?)

Do you think we should fix this now?

    const TITLE_STYLE = css`
      color: ${COLORS.grey60};
      padding-bottom: ${SPACING.spacing4};  ← this one
      text-align: ${textAlign};
      @media ${RESPONSIVENESS.touchscreenMediaQuerySpecs} {
        font-size: ${TYPOGRAPHY.fontSize22};
        font-weight: ${TYPOGRAPHY.fontWeightRegular};
        line-height: ${TYPOGRAPHY.lineHeight28};
        justify-content: ${textAlign};
      }
    `

close RQA-3434

Test Plan and Hands on Testing

Changelog

Review requests

low

Risk assessment

low

[jerader]

this makes sense to me!

[koji]

• update text
• fix tests errors