Toggle visibility with SetShown instead of Show/Hide branches

Each if/else that only showed one object in one branch and hid it in the other is now ClassicAPI's SetShown, which shows on any truthy value. 21 sites across 10 modules.

modules/farmmode.lua

@@ -1,10 +1,6 @@
 pfUI:RegisterModule("farmmode", function ()
   local function ToggleFarmMode()
-    if pfUI.farmmap:IsShown() then
-      pfUI.farmmap:Hide()
-    else
-      pfUI.farmmap:Show()
-    end
+    pfUI.farmmap:SetShown(not pfUI.farmmap:IsShown())
   end
 
   local function MoveNodes(layer)