fix: move centered drawing to func

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

@@ -185,15 +185,22 @@ log.info("broadcasted scan message")
 function updateScreen()
     local w, h = term.getSize()
 
+    local function drawTextCentered(text)
+        local x = (w / 2) - (text:len() / 2)
+        local curX, curY = term.getCursorPos()
+        term.setCursorPos(x, curY)
+        term.write(text)
+    end
+
     term.clear()
     term.setCursorPos(1, 1)
 
-    local title = "tutel host controller"
-    local titleStart = (w / 2) - (title:len() / 2)
-    term.setBackgroundColour(colours.red)
+    term.setBackgroundColour(colours.lightGray)
+    term.setTextColour(colours.black)
     term.clearLine()
-    term.setCursorPos(titleStart, 1)
-    term.write(title)
+    drawTextCentered("tutel host controller")
 end
 
-updateScreen()
+while true do
+    updateScreen()
+end