mjpeg_encoder: fix bool vs. boolean mismatch

Fixes:

  .../libcamera-apps-b1ca8997530f1f0290b291a956de359f2d4ce3e2/mjpeg_encoder.cpp:57:22: error: cannot convert ‘bool’ to ‘boolean’ in assignment
     57 |  cinfo.raw_data_in = true;
        |                      ^~~~
  compilation terminated due to -Wfatal-errors.

Signed-off-by: Peter Seiderer <[email protected]>

mjpeg_encoder.cpp

@@ -60,7 +60,7 @@ void MjpegEncoder::encodeJPEG(struct jpeg_compress_struct &cinfo, EncodeItem &it
 	cinfo.restart_interval = 0;
 
     jpeg_set_defaults(&cinfo);
-	cinfo.raw_data_in = true;
+	cinfo.raw_data_in = TRUE;
     jpeg_set_quality(&cinfo, options_.quality, TRUE);
 	encoded_buffer = nullptr;
 	buffer_len = 0;