Remove Ore primaryResource from towns that must get both Wood and Ore

Currently default behaviour is to give both wood and ore for resource bonus when primaryResource not specified.
Though for some reason towns currently have ore specified so you only get 5-10 Ore.

config/factions/castle.json

@@ -147,8 +147,8 @@
 			"warMachine" : "ballista",
 			"moatDamage" : 70,
 			"moatHexes" : [ 11, 28, 44, 61, 77, 111, 129, 146, 164, 181 ],
+			// primaryResource not specified so town get both Wood and Ore for resource bonus
 
-			"primaryResource": "ore",
 			"buildings" :
 			{
 				"mageGuild1":     { "id" : 0 },

config/factions/fortress.json

@@ -144,10 +144,10 @@
 			],
 			"horde" : [ 0, -1 ],
 			"mageGuild" : 3,
-			"primaryResource":"ore",
 			"warMachine" : "firstAidTent",
 			"moatDamage" : 90,
 			"moatHexes" : [ 10, 11, 27, 28, 43, 44, 60, 61, 76, 77, 94, 110, 111, 128, 129, 145, 146, 163, 164, 180, 181 ],
+			// primaryResource not specified so town get both Wood and Ore for resource bonus
 
 			"buildings" :
 			{

config/factions/necropolis.json

@@ -148,10 +148,10 @@
 			],
 			"horde" : [ 0, -1 ],
 			"mageGuild" : 5,
-			"primaryResource": "ore",
 			"warMachine" : "firstAidTent",
 			"moatDamage" : 70,
 			"moatHexes" : [ 11, 28, 44, 61, 77, 111, 129, 146, 164, 181 ],
+			// primaryResource not specified so town get both Wood and Ore for resource bonus
 
 			"buildings" :
 			{

config/factions/stronghold.json

@@ -118,7 +118,6 @@
 			"defaultTavern" : 5,
 			"tavernVideo" : "TAVERN.BIK",
 			"guildBackground" : "TPMAGE.bmp",
-			"primaryResource": "ore",
 			"townBackground": "TBSTBACK.bmp",
 			"guildWindow": "TPMAGEST.bmp",
 			"buildingsIcons": "HALLSTRN.DEF",
@@ -146,6 +145,7 @@
 			"warMachine" : "ammoCart",
 			"moatDamage" : 70,
 			"moatHexes" : [ 11, 28, 44, 61, 77, 111, 129, 146, 164, 181 ],
+			// primaryResource not specified so town get both Wood and Ore for resource bonus
 
 			"buildings" :
 			{