Fix scale number check

Modules/Config.lua

@@ -519,9 +519,12 @@ function shared.Config.Init()
     local scale = CreateBasicSmallEditBox("HeimdallConfigScale", configFrame.frame, "Scale", Heimdall_Data.config.scale,
         function(self)
             local text = self:GetText()
-            if string.match(text, "%d+") then
+            if string.match(text, "^%d+%.*%d*$") then
                 Heimdall_Data.config.scale = tonumber(text)
                 configFrame.frame:SetScale(Heimdall_Data.config.scale)
+            else
+                print(string.format("Invalid scale: %s, please use numbers", text))
+                self:SetText(Heimdall_Data.config.scale)
             end
         end)
     configFrame:Add(scale, 2, 2)