Try to avoid the timing UI issue

Tester exit network scan interface and then enter network scan activity
immediately. The previous network scan stop command effect the current
network scan.

Move "stop network scan" to first at onStop.

Bug: 276679520
Test: Build pass.
Change-Id: Ib0125c3745537a82b7574a8580d2a02c4e3644a0
1 file changed