[Toybox] [PATCH] scripts/runtest.sh: fix `toyonly` in a way that also works for mksh.

[enh]

mksh doesn't support the =~ extension, so my previous change -- while
fixing the host -- broke Android.
---
 scripts/runtest.sh | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
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