Remove redundant heap allocation in DisplayablePathBuf::from_string#336
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…microsoft#336) `DisplayablePathBuf::from_string` allocates two heap memories for `PathBuf` and `Cow::Owned`. However, it can be stored as `Cow::Borrowed` because `String` guarantees UTF-8 sequence. This can remove one redundant heap allocation.
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DisplayablePathBuf::from_stringallocates two heap memories forPathBufandCow::Owned. However it can be stored asCow::BorrowedbecauseStringguarantees UTF-8 sequence. This can remove one redundant heap allocation.As a bonusDisplayablePathBuf::from_pathcan be reused so the code is more simplified.