Fix condition for waiting next frame

mNextFrameNumber is initiallized to 1. If we want to wait
for the first frame to be drawn, one would expect to call mSurface.waitForNextFrame(0 /* lastFrame */),
but since mNextFrameNumber is always greater then lastFrame, the method
never waits.

Test: N/A
Bug: 376248818
Bug: 376828703
Flag: EXEMPT bug fix
Change-Id: I8804479bad8102a441a95951ac27c1cc0711d7b0

Author: vcaen

libs/gui/Surface.cpp

@@ -2735,8 +2735,8 @@ status_t Surface::unlockAndPost()
 
 bool Surface::waitForNextFrame(uint64_t lastFrame, nsecs_t timeout) {
     Mutex::Autolock lock(mMutex);
-    if (mNextFrameNumber > lastFrame) {
-      return true;
+    if (mLastFrameNumber > lastFrame) {
+        return true;
     }
     return mQueueBufferCondition.waitRelative(mMutex, timeout) == OK;
 }