Revert "- Duke: Restore a little bit of original code to make comparisons between us and the source easier."

This reverts commit 7607190dad.

* Not good in hindsight... We need the actual value from the backend to ensure we can match up against `WeaponSel_Next`/`WeaponSel_Prev`/`WeaponSel_Alt` as required.

source/games/duke/src/inlines.h

@@ -136,7 +136,7 @@ inline void PlayerSetInput(int pl, ESyncBits bit)
 
 inline int PlayerNewWeapon(int pl)
 {
-	return ps[pl].sync.getNewWeapon() - 1;
+	return ps[pl].sync.getNewWeapon();
 }
 
 inline void PlayerSetItemUsed(int pl, int num)

source/games/duke/src/input.cpp

@@ -243,8 +243,8 @@ void hud_input(int plnum)
 		}
 
 		int weap = PlayerNewWeapon(plnum);
-		if (weap > 0 && p->kickback_pic > 0)
-			p->wantweaponfire = weap;
+		if (weap > 1 && p->kickback_pic > 0)
+			p->wantweaponfire = weap - 1;
 
 		// Here we have to be extra careful that the weapons do not get mixed up, so let's keep the code for Duke and RR completely separate.
 		fi.selectweapon(plnum, weap);

source/games/duke/src/player_d.cpp

@@ -1299,7 +1299,7 @@ void selectweapon_d(int snum, int weap) // playernum, weaponnum
 					}
 				}
 			}
-			else j = weap;
+			else j = weap - 1;
 
 			k = -1;
 

source/games/duke/src/player_r.cpp

@@ -1071,7 +1071,7 @@ void selectweapon_r(int snum, int weap)
 					}
 				}
 			}
-			else j = weap;
+			else j = weap - 1;
 
 			k = -1;