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/unitxp.lua

@@ -42,11 +42,7 @@ pfUI:RegisterModule("unitxp", function ()
         end
 
         local success, behind = pcall(UnitXP, "behind", "player", "target")
-        if success and behind then
-          this.text:Show()
-        else
-          this.text:Hide()
-        end
+        this.text:SetShown(success and behind)
       end)
 
       pfUI.uf.target.behindIndicator = behindFrame
@@ -76,11 +72,7 @@ pfUI:RegisterModule("unitxp", function ()
         end
 
         local success, inSight = pcall(UnitXP, "inSight", "player", "target")
-        if success and inSight == false then
-          this.text:Show()
-        else
-          this.text:Hide()
-        end
+        this.text:SetShown(success and inSight == false)
       end)
 
       pfUI.uf.target.losIndicator = losFrame