internal/lsp: fix diagnostics not clearing when creating new files
internal/lsp: fix diagnostics not clearing when creating new files

This change fixes an issue where import errors would not disappear when creating new files in a module by removing the segment of code where we check for listErrors when fixing imports.

Updates golang/go#36960

Change-Id: Iefa17edeb0417cac7e33ffa88faf7c9a607e98b3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/219222
Run-TryBot: Rohan Challa <9671c73253cee9b18b8df367e3e627fab2863fe8@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools