Fix wifi coverage.sh script

Recent changes to the build cause the test APK to be put in a different
location than before.

This modifies coverage.sh to find it no matter where it lands.

There is probably a better way.

Bug: 128603658
Test: ./frameworks/opt/net/wifi/tests/wifitests/coverage.sh /tmp/cov
Test: Tested on aosp_blueline-userdebug and aosp_cf_x86_64_phone-eng
Change-Id: Iba7cc97115f376dcfd2904bb6e34ef3d39403ce3
1 file changed