change format of cargo compile finish time taken

[connortsui20]

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Very very minor change that changes the format of cargo's compile message.

There were a couple of cargo messages formatted as 1.23 secs, which doesn't seem to be what cargo outputs nowadays. Also, there were a couple of 0.0s instead of 0.00s. Changed all of them to match what cargo actually outputs now, which is 1.23s.

Not exactly sure which version of cargo this changes in, but at least on stable windows and stable linux this is the correct format.