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/test/Common.cpp b/tools/aapt2/test/Common.cpp
index b54c155..23c2218 100644
--- a/tools/aapt2/test/Common.cpp
+++ b/tools/aapt2/test/Common.cpp
@@ -21,7 +21,7 @@
 namespace aapt {
 namespace test {
 
-struct DummyDiagnosticsImpl : public IDiagnostics {
+struct TestDiagnosticsImpl : public IDiagnostics {
   void Log(Level level, DiagMessageActual& actual_msg) override {
     switch (level) {
       case Level::Note:
@@ -39,7 +39,7 @@
 };
 
 IDiagnostics* GetDiagnostics() {
-  static DummyDiagnosticsImpl diag;
+  static TestDiagnosticsImpl diag;
   return &diag;
 }