audio: Fix SourceMetadata spec in HAL V7 VTS

This was missed in aosp/1576846.

Bug: 142480271
Test: atest VtsHalAudioV7_0TargetTest
Change-Id: I96952b7e17b4098f16c3dc889e36d316a6673213
diff --git a/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp b/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp
index bb7c6d3..f87e5ed 100644
--- a/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp
+++ b/audio/core/all-versions/vts/functional/4.0/AudioPrimaryHidlHalTest.cpp
@@ -322,9 +322,9 @@
                 const SourceMetadata metadata = {
                         {{toString(usage),
                           toString(content),
-                          {} /* tags */,
+                          volume,
                           toString(xsd::AudioChannelMask::AUDIO_CHANNEL_OUT_STEREO),
-                          volume}}};
+                          {} /* tags */}}};
                 ASSERT_RESULT(okOrNotSupported, stream->updateSourceMetadata(metadata))
                         << "usage=" << toString(usage) << ", content=" << toString(content)
                         << ", volume=" << volume;