fix: make bg color black before clearing screen

lua/CC Tweaked/tutel/tutel-host.lua

@@ -192,6 +192,7 @@ function updateScreen()
         term.write(text)
     end
 
+    term.setBackgroundColor(colors.black)
     term.clear()
     term.setCursorPos(1, 1)
 
@@ -200,3 +201,7 @@ function updateScreen()
     term.clearLine()
     drawTextCentered("tutel host controller")
 end
+
+while true do
+    updateScreen()
+end