Adjust layout width divisor

More closely match the width/height ration to how the fonts is rendered,
making the ratio of 100 closer to square.

layouts/window-auto

@@ -2,7 +2,7 @@
 
 cols=`tmux display -p "#{pane_width}"`
 lines=`tmux display -p "#{pane_height}"`
-width=$(( $cols / 2 )).0
+width=$(( $cols / 2.5 ))
 height=$lines.0
 ratio=$(( ($width / $height) * 100 ))