CCodecConfig: round frame rate instead of truncating to increase the
accuracy

Bug: b/228607622
Test: encode a video and print log
Change-Id: Iba455e8472a3f21c66b90b4ad994287773566b31
diff --git a/media/codec2/sfplugin/CCodecConfig.cpp b/media/codec2/sfplugin/CCodecConfig.cpp
index dd37c4b..68789db 100644
--- a/media/codec2/sfplugin/CCodecConfig.cpp
+++ b/media/codec2/sfplugin/CCodecConfig.cpp
@@ -383,7 +383,7 @@
             // read back always as int
             float value;
             if (v.get(&value)) {
-                return (int32_t)value;
+                return (int32_t) (value + 0.5);
             }
             return C2Value();
         }));