Update language to comply with inclusive guidance

Update android_app_set to use word install rather than master for
android_app_sets, this better matches the phrasing used for apex_set.

See https://source.android.com/setup/contribute/respectful-code for
reference

Bug: 161896447
Test: m nothing
Change-Id: I429e7f8b16c42c10ad4d9543110f5ce814a893b1