fix: FrameConverter only copies upper square on portrait-format video

It should be copying lines for the height of the image, not the width.
Width happened to work since a lot of test videos are landscape.

api-ffmpeg/src/main/java/org/jmisb/api/video/FrameConverter.java

@@ -53,7 +53,7 @@ public BufferedImage convert(AVFrame frame) {
         byte[] a = ((DataBufferByte) out).getData();
 
         ByteBuffer src =
-                frame.data(0).capacity((long) frame.width() * (long) frame.linesize(0)).asBuffer();
+                frame.data(0).capacity((long) frame.height() * (long) frame.linesize(0)).asBuffer();
         copy(src, frame.linesize(0), ByteBuffer.wrap(a, start, a.length - start), step);
 
         return bufferedImage;