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
diff --git a/java/androidmk.go b/java/androidmk.go
index 25dd329..081fcb2 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -728,7 +728,7 @@
 			ExtraEntries: []android.AndroidMkExtraEntriesFunc{
 				func(entries *android.AndroidMkEntries) {
 					entries.SetBoolIfTrue("LOCAL_PRIVILEGED_MODULE", apkSet.Privileged())
-					entries.SetString("LOCAL_APK_SET_MASTER_FILE", apkSet.masterFile)
+					entries.SetString("LOCAL_APK_SET_INSTALL_FILE", apkSet.InstallFile())
 					entries.SetPath("LOCAL_APKCERTS_FILE", apkSet.apkcertsFile)
 					entries.AddStrings("LOCAL_OVERRIDES_PACKAGES", apkSet.properties.Overrides...)
 				},