fix(ui): use a Vue key so file paths update correctly

[artursapek]

this fixes a bug with this plugin where the file paths & line numbers don't update correctly after a hot reload. the error message for each entry does update while the file paths confusingly don't, therefore creating an incorrect list of errors.

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Latest commit: e7b4f45796bd8c4cbac7171bfb8eaf92c085cefd

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