Remove drain_period_ms option from default config

This change removes the 'drain_period_ms: 1000' line from the default
trace config. This should help avoid cases where trace data is being
dropped.

Test: Capture a trace to check that it still records (and looks okay).
Bug: 290891913
(cherry picked from https://android-review.googlesource.com/q/commit:ba97930f250b3639afcd8fc328bf78fafa4f84d7)
(cherry picked from commit 766ec8516cc181b449268a2191657c3da9c4f6a1)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:468ef2008116b32a0a4116a9a73814c0bada65f1)
Merged-In: I0594ea29a0884026da7beef0ae60923fe9e4566f
Change-Id: I0594ea29a0884026da7beef0ae60923fe9e4566f