libcamera: fix bytesperline calculation for libcamera0.2 (#140)

For libcamera0.2 configuraiton.stride is already set to some incorrect value and configurations->validate() doesn't update it if it's not 0.

For libcamera0.1 it was set to 0. So set it to 0 manually to make sure configurations->validate() computes the correct value.

device/libcamera/buffer_list.cc

@@ -92,6 +92,8 @@ int libcamera_buffer_list_open(buffer_list_t *buf_list)
   }
   if (buf_list->fmt.bytesperline > 0) {
     configuration.stride = buf_list->fmt.bytesperline;
+  } else {
+    configuration.stride = 0;
   }
   if (buf_list->fmt.nbufs > 0) {
     configuration.bufferCount = buf_list->fmt.nbufs;