async_hooks: don't set hook_fields[kTotals] to 0
This commit removes the setting of hook_field[kTotals] to szero in AsyncHook's enable function.
As far as I can tell this would not be required if the setting of this field is done with the assignment operator instead of using the addition assignment operator.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines