Bugfix for status overlay screenshot.

Change from 12 hour clock to 24 hour clock so the snapshots remain in
better lexographical order. Also add seconds to the timestamp to fix bug
where if you took too multiple screenshots within a minute, subsequent
pictures would overwrite the previous ones.

code/power/status_overlay/status_overlay.py

@@ -503,7 +503,7 @@ def handle_power_button_press(channel):
         else:
             # long press has happened
             screenshot_call = "raspi2png -c 9 -p " + CONFIG["SCREENSHOT_PATH"] + "/snapshot-" + \
-                datetime.datetime.now().strftime("%m%d%Y-%I%M") + ".png"
+                datetime.datetime.now().strftime("%m%d%Y-%H%M%S") + ".png"
             subprocess.Popen(screenshot_call, shell=True)
             draw_notification("snapshot_notification.png", "snapshot", 3)
     else: