Fix modeline

```
kabelkrant@kabelkrant:~ $ gtf 1920 1080 50

  # 1920x1080 @ 50.00 Hz (GTF) hsync: 55.60 kHz; pclk: 141.45 MHz
  Modeline "1920x1080_50.00"  141.45  1920 2032 2232 2544  1080 1081 1084 1112  -HSync +Vsync
```

install.sh

@@ -83,11 +83,11 @@ xset s off          # Disable screen saver.
 xset s noblank      # Don't blank the video device.
 
 # Set the resolution and position monitor 2 to the right of monitor 1
-xrandr --newmode "1920x1080_50.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
-xrandr --addmode HDMI-1 1920x1080_50.00
+xrandr --newmode "1920x1080_50.00"  141.45  1920 2032 2232 2544  1080 1081 1084 1112  -HSync +Vsync
+xrandr --addmode HDMI-1 "1920x1080_50.00"
 
 # Set HDMI-1 as the primary monitor
-xrandr --output HDMI-1 --primary --mode 1920x1080_50.00 --rate 50
+xrandr --output HDMI-1 --mode "1920x1080_50.00"
 
 # Hide the mouse cursor when idle
 unclutter -idle 0 &