samples: drivers: video: fix capture_to_lvgl statistics

CONFIG_LV_USE_PERF_MONITOR depends on CONFIG_LV_USE_SYSMON.

Signed-off-by: Antonino Scarpaci <antonino.scarpaci@gmail.com>

Author: NinoSc

samples/drivers/video/capture_to_lvgl/prj.conf

@@ -14,3 +14,5 @@ CONFIG_LV_CONF_MINIMAL=y
 CONFIG_LV_USE_IMAGE=y
 CONFIG_LV_Z_MEM_POOL_SIZE=16384
 CONFIG_LV_USE_PERF_MONITOR=y
+CONFIG_LV_USE_DROPDOWN=y
+CONFIG_LV_USE_SYSMON=y