HWC2On1Adapter: Fix fd leak in Layer::dump

Removes the fence dump from Layer::dump, since:
  a) It was leaking (a dup() without a close())
  b) It's not that useful anyway since it wasn't displaying the actual
     fence fd

Test: Manual
Bug: 73979009
Change-Id: I8f7446a05a1bab8c3ca781610ebeb98d17fa483b
diff --git a/graphics/composer/2.1/utils/hwc2on1adapter/HWC2On1Adapter.cpp b/graphics/composer/2.1/utils/hwc2on1adapter/HWC2On1Adapter.cpp
index 77f06bb..d0167d9 100644
--- a/graphics/composer/2.1/utils/hwc2on1adapter/HWC2On1Adapter.cpp
+++ b/graphics/composer/2.1/utils/hwc2on1adapter/HWC2On1Adapter.cpp
@@ -2094,8 +2094,7 @@
     } else if (mCompositionType == HWC2::Composition::Sideband) {
         output << "  Handle: " << mSidebandStream << '\n';
     } else {
-        output << "  Buffer: " << mBuffer.getBuffer() << "/" <<
-                mBuffer.getFence() << '\n';
+        output << "  Buffer: " << mBuffer.getBuffer() << '\n';
         output << fill << "  Display frame [LTRB]: " <<
                 rectString(mDisplayFrame) << '\n';
         output << fill << "  Source crop: " <<