[ISurfaceComposer] Fix wrong returned value.

Previously we returned the value of data space as the value of pixel format by
accident, this patch fixes it.

BUG: 111436479
Test: Build, flash, boot and verify with demo app.
Change-Id: If03a322210e666cf57aba3a0a4171137440dbc15
diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index f1fefcc..bd943c1 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -1033,7 +1033,7 @@
                 reply->writeInt32(static_cast<int32_t>(defaultDataspace));
                 reply->writeInt32(static_cast<int32_t>(defaultPixelFormat));
                 reply->writeInt32(static_cast<int32_t>(wideColorGamutDataspace));
-                reply->writeInt32(static_cast<int32_t>(wideColorGamutDataspace));
+                reply->writeInt32(static_cast<int32_t>(wideColorGamutPixelFormat));
             }
             return NO_ERROR;
         }