fix(printer): don't wrap broken when-guards in parentheses

[braxtonzhangio]

Summary

With a narrow printWidth, when guards in switch rules wrapped the expression in parentheses (when ( … )). Those parens are unnecessary for Java pattern guards and look noisy next to the trailing ->.

Changes

• Print when guards by breaking/indenting the expression instead of using ifBreak("(" / ")").
• Update the existing wrapping snapshot and add a regression fixture for Adds needlessly parentheses #1001 (printWidth: 40).

Test plan

• npm test (or the repo’s usual unit-test command for test/unit-test)
• Fixture switch-when-guard-parens matches expected output

Fixes #1001