Removes duplicate trivia from UnsafeExprSyntax

[TTOzzi]

When creating UnsafeExprSyntax, the leadingTrivia passed as an argument from unsafeExpr.leadingTrivia is already included in unsafeExpr.unsafeKeyword, which causes the trivia to be duplicated if it exists. To fix this, I modified the code to avoid passing leadingTrivia as an argument. (Similarly, the same applies to trailingTrivia.)

I couldn’t find a suitable way to directly test UnsafeExprSyntax created via OperatorTable, so I verified the change by integrating my local modifications into swift-format.
Please let me know if there’s a better way to test this.

[ahoppen]

Thanks for the fix @TTOzzi.

You should be able to test this using

func testTriviaAroundUnsafe() throws {
  let original = ExprSyntax("/*leading*/ unsafe a + b")
  let folded = try OperatorTable.standardOperators.foldAll(original)
  XCTAssertEqual(original.description, folded.description)
}

[TTOzzi]

Thanks for the fix @TTOzzi.

You should be able to test this using

func testTriviaAroundUnsafe() throws {
  let original = ExprSyntax("/*leading*/ unsafe a + b")
  let folded = try OperatorTable.standardOperators.foldAll(original)
  XCTAssertEqual(original.description, folded.description)
}

Thank you for letting me know! 🙇
I've added test cases for the changes.

[ahoppen]

Thanks for the fix!

[ahoppen]

@swift-ci Please test