[Toybox] [PATCH] fixes for the 'ts' command

[Oliver Webb]

This patch fixes a memory leak in ts by making sure it frees the pointers given by xgetline()

I knew about this leak for a few days and was planning to submit a patch for it some time in the future, 
but now that ts got promoted I feel like I should submit it sooner rather then later

The other fix is that if it's doing -i or -s it uses gmtime() instead of localtime() 
so the timestamp starts at 00:00:00 instead of something like 20:00:00 for PDT or 18:00:00 for CST.
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