fixed tabs in nvt

module/nvt100.lua

@@ -55,7 +55,7 @@ function vt100emu(gpu) -- takes GPU component proxy *gpu* and returns a function
      flushwb()
      cx,cy = 1, cy+1
     elseif cc == "\t" then
-     cx = 8*((cx+9)//8)
+     wb=wb..(" "):rep(8*((cx+9)//8))
     elseif cc == "\27" then
      flushwb()
      mode = 1