Prevent Spell Targeting Players with Friendly Mode enabled

Prevents players from targeting each other with spells in the same way that players are prevented from targeting each other with weapons when Friendly Mode is enabled

Source/player.cpp

@@ -3500,7 +3500,7 @@ void CheckPlrSpell(bool isShiftHeld)
 		LastMouseButtonAction = MouseActionType::SpellMonsterTarget;
 		sl = GetSpellLevel(MyPlayerId, myPlayer._pRSpell);
 		NetSendCmdParam4(true, CMD_SPELLID, pcursmonst, myPlayer._pRSpell, myPlayer._pRSplType, sl);
-	} else if (pcursplr != -1 && !isShiftHeld) {
+	} else if (pcursplr != -1 && !isShiftHeld && !gbFriendlyMode) {
 		LastMouseButtonAction = MouseActionType::SpellPlayerTarget;
 		sl = GetSpellLevel(MyPlayerId, myPlayer._pRSpell);
 		NetSendCmdParam4(true, CMD_SPELLPID, pcursplr, myPlayer._pRSpell, myPlayer._pRSplType, sl);