[NT-730] Pledge screen header label fix

[Scollaco]

📲 What

• Fixed a visual bug where the date label, when the text is too long, adds a new line.

🤔 Why

• To match the design.

🛠 How

• Instead of setting the numberOfLines to 0, I set the minimumScaleFactor to 0.5. This way, the text will scale down up to half of its original size before it truncates.

👀 See

Before 🐛	After 🦋

♿️ Accessibility

• Works with VoiceOver
• Supports Dynamic Type

✅ Acceptance criteria

• Search for the project Mawu and select the Get the original SOUNDTRACK of MAWU reward. The header on the Pledge screen should show Estimated delivery September 2020 in one line. (You can select any project, but the estimated delivery text should be long enough to prove that the label is not breaking line).

[cdolm92]

Amazing!! 🛳🛳👩🏾‍✈️