Update flash_stream.c

fixes https://github.com/raspberrypi/pico-playground/issues/32

scanvideo/flash_stream/flash_stream.c

@@ -133,7 +133,11 @@ void __time_critical_func(render_scanline)(struct scanvideo_scanline_buffer *des
 }
 
 int main(void) {
+#ifdef TURBO_BOOST
+    set_sys_clock_khz(300000, true);
+#else
     set_sys_clock_khz(200000, true);
+#endif
     setup_default_uart();
     
 #ifdef PICO_SMPS_MODE_PIN