wait-on-file: adjust the timer counter
The wait performed in increment of 0.01 second, but the timer was expressed in
second. So we did not wait 20s, we waited 0.2 second. Internally we adjust the
counter to be expressed in centisecond. This prevent some flackyness in the
test.
Differential Revision: https://phab.mercurial-scm.org/D8453
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