Change the Spy and Medic's default weapons.

The Spy starts out with his Knife and the Medic with his Medi-Gun.

cfg/spy.cfg

@@ -8,6 +8,11 @@ exec _reset.cfg
 spy_music
 
 
+// Knife
+// Starts the game with the knife active.
+slot3
+
+
 // Taunt
 // Automatically undisguises the spy before performing a taunt.
 // Note: most of the time, removing the disguise will not happen quickly