SAGA2: Fix various cleanup steps

engines/saga2/speldata.cpp

@@ -152,7 +152,7 @@ void cleanupMagic(void) {
 	for (int i = 0; i < maxSpells; i++) {
 		spellBook[i].killEffects();
 	}
-	delete spellBook;
+	delete[] spellBook;
 
 	g_vm->_sdpList->cleanup();
 	g_vm->_edpList->cleanup();

engines/saga2/speldraw.cpp

@@ -174,7 +174,7 @@ void SpellDisplayPrototypeList::cleanup(void) {
 				delete spells[i];
 				spells[i] = nullptr;
 			}
-		delete spells;
+		delete[] spells;
 		spells = nullptr;
 		maxCount = 0;
 	}

engines/saga2/tile.cpp

@@ -1503,9 +1503,6 @@ void cleanupMaps(void) {
 	//  Dump all of the tile terrain banks
 	for (i = 0; i < maxBanks; i++) {
 		if (tileBanks[i] != nullptr) {
-			if (tileBanks[i]->_tileArray != nullptr)
-				delete[] tileBanks[i]->_tileArray;
-
 			delete tileBanks[i];
 			tileBanks[i] = nullptr;
 		}