Fix for issue 3456480 A/V not in sync when a picture is added followed by a video clip trimmed from start

Change-Id: I7a46f7fc20de9a6c0ebbc2ad03dca898306bad6b
diff --git a/libvideoeditor/lvpp/PreviewPlayer.cpp b/libvideoeditor/lvpp/PreviewPlayer.cpp
index 7d08a9f..9bae14a 100644
--- a/libvideoeditor/lvpp/PreviewPlayer.cpp
+++ b/libvideoeditor/lvpp/PreviewPlayer.cpp
@@ -491,6 +491,8 @@
 
 status_t PreviewPlayer::play_l() {
 
+    mFlags &= ~SEEK_PREVIEW;
+
     if (mFlags & PLAYING) {
         return OK;
     }
@@ -1769,11 +1771,6 @@
 status_t PreviewPlayer::readFirstVideoFrame() {
     LOGV("PreviewPlayer::readFirstVideoFrame");
 
-    if (mFlags & SEEK_PREVIEW) {
-        mFlags &= ~SEEK_PREVIEW;
-        return OK;
-    }
-
     if (!mVideoBuffer) {
         MediaSource::ReadOptions options;
         if (mSeeking) {