[Toybox] [PATCH] watch: fix initial output.

[enh]

The first character of the first line of child output, the first
time the child is run, was being shown as the last character of the
header because of the use of a not-yet-set variable.
---
 toys/other/watch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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