Minor tent fix (#4002)

# About the pull request

Tent height was increased in #3918

Command and Medical tent height was increased
However Req and Big tent height was not increased.

This PR increases tent height for Req and Big tent

# Explain why it's good for the game

Whoops... forgot to change these vars

code/modules/tents/deployed_tents.dm

@@ -149,10 +149,10 @@
 	icon_state = "big_interior"
 	roof_state = "big_top"
 	x_dim = 3
-	y_dim = 3
+	y_dim = 4
 
 /obj/structure/tent/reqs
 	icon_state = "reqs_interior"
 	roof_state = "reqs_top"
 	x_dim = 4
-	y_dim = 3
+	y_dim = 4