show message with try block in map_unwrap_or

[kyoto7250]

close #13242

This PR fixes the issue where errors from map_unwrap_or were only partially displayed. When the error spans multiple lines, it needs to be shown in a block format.

changelog:
Corrected the error display for map_unwrap_or.

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[y21]

I've thought about this for a bit and I'm unsure if this is something we should fix in clippy. This seems more like a bug in the compiler to me (presumably the emitter code that's responsible for rendering these), given that the spans and replacements are right and rustfix can apply the suggestion with no issue.

map_unwrap_or is not the only lint that is affected by this bug. It seems to happen to pretty much almost any lint that uses multipart_suggestion and an empty replacement on a separate line. E.g. redundant_guards: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=80efbab3a6429e898ec637c8d9c1efb8 (note how the suggestion doesn't actually have the guard removed)

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I opened a zulip thread for this, to see what others think if it's worth working around this in clippy: https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/Verbose.20suggestion.20missing.20line.20deletions