idmap2: fix clang-tidy warnings [modernize-*]

Bug: 120024673
Test: mmm frameworks/base/cmds/idmap2; check output
Change-Id: I8768169fb7b541eb6b1aa3311c46a710eb71aac9
diff --git a/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp b/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp
index 3b9dbe9..2698ac0 100644
--- a/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp
+++ b/cmds/idmap2/tests/BinaryStreamVisitorTests.cpp
@@ -31,8 +31,7 @@
 
 using ::testing::NotNull;
 
-namespace android {
-namespace idmap2 {
+namespace android::idmap2 {
 
 TEST(BinaryStreamVisitorTests, CreateBinaryStreamViaBinaryStreamVisitor) {
   std::string raw(reinterpret_cast<const char*>(idmap_raw_data), idmap_raw_data_len);
@@ -124,5 +123,4 @@
   ASSERT_FALSE(success);
 }
 
-}  // namespace idmap2
-}  // namespace android
+}  // namespace android::idmap2