You can fall to the floor while prone.

[chrispikula]

Describe the bug

If you are utterly drunk, and prone, you can fall to the floor, and then need to stand back up (to prone).

Steps To Reproduce

Spawn a new character.
Drink heavily, till you start really complaining about it.
Go prone, and move around.

Expected behavior

Changing the text to 'You can't move' or 'You momentarily black out' and 'You are able to move again'.
It doesn't appear that there's any mechanical effects to this, so I don't think there's any need to worry about damage, just the strings.

Screenshots

You can get 'knocked down' and 'stand up' while prone

As proof that I'm still prone, move speed is 440:

Versions and configuration

12:21:12.315 : Starting log.
12:21:12.315 INFO : Cataclysm DDA version d213995
12:21:12.315 INFO : [main] C locale set to C
12:21:12.315 INFO : [main] C++ locale set to C
12:21:12.315 INFO : SDL version used during compile is 2.0.14
12:21:12.315 INFO : SDL version used during linking and in runtime is 2.0.14
12:21:12.528 INFO : Number of render drivers on your system: 5
12:21:12.528 INFO : Render driver: 0/direct3d
12:21:12.528 INFO : Render driver: 1/direct3d11
12:21:12.528 INFO : Render driver: 2/opengl
12:21:12.528 INFO : Render driver: 3/opengles2
12:21:12.528 INFO : Render driver: 4/software
12:21:12.533 INFO : [options] C locale set to C
12:21:12.533 INFO : [options] C++ locale set to C
12:21:12.533 INFO : Setting language to: 'en'
12:21:12.533 INFO : Language is set to: 'en'
12:21:12.533 INFO : [translations] C locale set to English_Canada.1252
12:21:12.533 INFO : [translations] C++ locale set to C
12:21:12.785 INFO : Active renderer: 0/direct3d
12:21:13.020 INFO : USE_COLOR_MODULATED_TEXTURES is set to 0
12:21:13.224 INFO : Setting language to: 'en'
12:21:13.224 INFO : Language is set to: 'en'
12:21:13.224 INFO : [translations] C locale set to English_Canada.1252
12:21:13.224 INFO : [translations] C++ locale set to C
12:21:20.281 WARNING : opendir [./save/Hargis/mods] failed with "No such file or directory".
12:21:48.680 INFO : Loaded tileset: UNDEAD_PEOPLE_BASE
12:21:57.957 ERROR SDL : src/sdlsound.cpp:583: Failed to play sound effect: Tried to play a chunk with a bad frame

Additional context

No response