Fix missing module slots for various entities

Bio_Industries_2/prototypes/Bio_Farm/entities.lua

@@ -506,7 +506,7 @@ data:extend({
         resistances = { { type = "fire", percent = 95 } },
         collision_box = { { -1.2, -1.2 }, { 1.2, 1.2 } },
         selection_box = { { -1.5, -1.5 }, { 1.5, 1.5 } },
-        module_specification = { module_slots = 2 },
+        module_slots = 2,
         allowed_effects = { "consumption", "speed", "pollution" },
 		graphics_set = {
 			-- Working animation (16 frames)

Bio_Industries_2/prototypes/Bio_Fuel/entities.lua

@@ -195,9 +195,7 @@ data:extend({
         ingredient_count = 3,
         crafting_speed = 1,
         energy_usage = "10kW",
-        module_specification = {
-            module_slots = 3
-        },
+        module_slots = 3,
         allowed_effects = { "consumption", "speed", "productivity", "pollution" },
     },
 	

Bio_Industries_2/prototypes/Bio_Garden/entities.lua

@@ -84,9 +84,7 @@ data:extend({
     -- Changed for 0.18.34/1.1.4 -- Modules don't make sense for the gardens!
     -- (Efficiency modules are also meant to reduce pollution, but as the base value
     -- is negative, the resulting value is greater than the base value! )
-    module_specification = {
-      module_slots = 1
-    },
+    module_slots = 1,
     -- Changed for 0.18.34/1.1.4 -- We need to use an empty table here, so the gardens
     -- won't be affected by beacons!
     allowed_effects = { "consumption", "speed" },
@@ -224,9 +222,7 @@ data:extend({
     -- Changed for 0.18.34/1.1.4 -- Modules don't make sense for the gardens!
     -- (Efficiency modules are also meant to reduce pollution, but as the base value
     -- is negative, the resulting value is greater than the base value! )
-    module_specification = {
-      module_slots = 2
-    },
+    module_slots = 2,
     -- Changed for 0.18.34/1.1.4 -- We need to use an empty table here, so the gardens
     -- won't be affected by beacons!
     allowed_effects = { "consumption", "speed" },
@@ -406,9 +402,7 @@ data:extend({
     -- Changed for 0.18.34/1.1.4 -- Modules don't make sense for the gardens!
     -- (Efficiency modules are also meant to reduce pollution, but as the base value
     -- is negative, the resulting value is greater than the base value! )
-    module_specification = {
-      module_slots = 4
-    },
+    module_slots = 4,
     -- Changed for 0.18.34/1.1.4 -- We need to use an empty table here, so the gardens
     -- won't be affected by beacons!
     allowed_effects = { "consumption", "speed" },