Make aapt2 terminology more inclusive

Update language to comply with Android's inclusive language guidance

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

Bug: 162364131
Bug: 162536543
Test: aapt2_tests
Change-Id: I4eef925d6319b40a395fc8d59a3f2912a02ca03b
diff --git a/tools/aapt2/cmd/Optimize.h b/tools/aapt2/cmd/Optimize.h
index 5070ccc..3afc46b 100644
--- a/tools/aapt2/cmd/Optimize.h
+++ b/tools/aapt2/cmd/Optimize.h
@@ -36,8 +36,8 @@
   // Details of the app extracted from the AndroidManifest.xml
   AppInfo app_info;
 
-  // Blacklist of unused resources that should be removed from the apk.
-  std::unordered_set<ResourceName> resources_blacklist;
+  // Exclude list of unused resources that should be removed from the apk.
+  std::unordered_set<ResourceName> resources_exclude_list;
 
   // Split APK options.
   TableSplitterOptions table_splitter_options;