[bug#73227] Remove phase 'skip-gtk-update-icon-cache from Tilix

[Ashvith Shetty]

Hello,

I should've made this clearer in the previous issue that I've opened. There is no to keep the phase 'skip-gtk-update-icon-cache, as the two new native-inputs I've added respectively, `(,glib "bin") and `(,gtk+ "bin") fixes the issues with meson's post-install Python script.