Fixes Rock Paper Scissors emotes (#8307)

# About the pull request

Fixes: #8300 

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# Explain why it's good for the game
Bug bad.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
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</details>


# Changelog

code/__DEFINES/mobs.dm

@@ -290,11 +290,11 @@
 #define PANDEMIC 2
 
 //emote flags
-#define EMOTING_HIGH_FIVE  1
-#define EMOTING_FIST_BUMP  2
-#define EMOTING_HEADBUTT   3
-#define EMOTING_TAIL_SWIPE 4
-#define EMOTING_ROCK_PAPER_SCISSORS 5
+#define EMOTING_HIGH_FIVE  (1<<0)
+#define EMOTING_FIST_BUMP  (1<<1)
+#define EMOTING_HEADBUTT   (1<<2)
+#define EMOTING_TAIL_SWIPE (1<<3)
+#define EMOTING_ROCK_PAPER_SCISSORS (1<<4)
 
 //forcesay types
 #define SUDDEN 0

code/modules/mob/living/carbon/xenomorph/XenoAttacks.dm

@@ -128,7 +128,7 @@
 				return XENO_NONCOMBAT_ACTION
 			else if(flags_emote & EMOTING_TAIL_SWIPE)
 				xeno.attempt_tailswipe(src)
-				return
+				return XENO_NONCOMBAT_ACTION
 			else if(xeno.zone_selected == "head")
 				xeno.attempt_headbutt(src)
 				return XENO_NONCOMBAT_ACTION