Make jumpgun not use any ammo type

 - Fixes fortressforever/fortressforever#300

Author: squeek502

scripts/ff_weapon_jumpgun.txt

@@ -27,7 +27,7 @@ WeaponData
 	"default_clip"			"50"
 	"default_clip2"			"-1"	
 
-	"primary_ammo"			"AMMO_NAILS"
+	"primary_ammo"			"None"
 	"secondary_ammo"		"None"
 
 	"ffencrypted"	"1" // required for the script to load
@@ -65,11 +65,6 @@ WeaponData
 				"font"		"WeaponIconsSelected"
 				"character"	"t"
 		}
-		"ammo"
-		{
-				"font"		"WeaponIconsSmall"
-				"character"	"7"
-		}
 		"crosshair"
 		{
 				"file"		"sprites/crosshairs"