Reset the terminal color before the newline for diagnostics

When printing colored diagnostics, we need to reset the terminal before
emitting the newline, not after. Otherwise it gets line-buffered and the
color won't reset until the next line is printed or the compiler exits.

Normally this isn't a problem, but when running rustc in parallel with
other processes (e.g. `make -j4`) this can cause the color to leak
to other lines.

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