unix2dos on tests/FlatBuffers.Test/FlatBuffers.Core.Test.csproj

[Shixiaowei02]

Due to the problem of the newline format (CRLF), after pulling the latest master branch, it is not possible to switch to the old commit on the unix platform. This commit attempts to fix the problem.

% git checkout v1.12.0
error: Your local changes to the following files would be overwritten by checkout:
	tests/FlatBuffers.Test/FlatBuffers.Core.Test.csproj
Please, commit your changes or stash them before you can switch branches.
Aborting

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