disable titlebar in sway

this patch for Sway 1.9 which adds the 'disable_titlebar' option in the config file.

Instruction:

1. Download latest Sway-1.9 source tarball: https://github.com/swaywm/sway/archive/refs/tags/1.9.tar.gz
2. Download patch: disable_titlebar_patch.tar.gz
3. Extract Sway-1.9 tarball
4. Extract patch and move to sway-1.9 folder
5. Go to the sway-1.9 folder and apply the patch
6. Compile and install sway (Run these commands):

tar xf sway-1.9.tar.gz
tar xf disable_titlebar_patch.tar.gz; mv disable_titlebar.patch sway-1.9/
cd sway-1.9/; patch -p1 < disable_titlebar.patch
meson build/
ninja -C build/
sudo ninja -C build/ install

7. Edit ~/.config/sway/config file and add the option: disable_titlebar yes or read man 5 sway xD.
   For example, a piece of my ~/.config/sway/config:

xwayland disable
workspace_layout tabbed
default_border none
default_floating_border none
disable_titlebar yes

Enjoy.

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Thanks to y0nei for the feedback, I added a fix for drawing the top border.

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