feat: installer modified for FDE

Author: bketelsen

snow_first_setup/gtk/window.ui

@@ -4,7 +4,7 @@
   <requires lib="libadwaita" version="1.0" />
   <template class="VanillaWindow" parent="AdwApplicationWindow">
     <property name="default-width">800</property>
-    <property name="default-height">750</property>
+    <property name="default-height">800</property>
     <property name="title">First Setup</property>
     <property name="deletable">False</property>
     <child>