Disable Runes Hide Blizzard option

This is no longer functional in 10.0 and I can't find an easy replacement, so I'm removing the functionality for 10.0+ for now. The entire player frame can still be hidden, which also hides the runes, so I don't feel like this is super critical to have.

Fixes #26

modules/Runes.lua

@@ -134,6 +134,9 @@ function Runes.prototype:GetOptions()
 		disabled = function()
 			return not self.moduleSettings.enabled
 		end,
+		hidden = function()
+			return not PlayerFrame_HideVehicleTexture
+		end,
 		order = 32
 	}
 
@@ -581,6 +584,10 @@ local function hook_playerframe()
 end
 
 function Runes.prototype:HideBlizz()
+	if not PlayerFrame_HideVehicleTexture then
+		return
+	end
+
 	RuneFrame:Hide()
 	RuneFrame:UnregisterAllEvents()