Drop quick exit feature

Broken now due to multiple navigation destinations unlike before
when there were only 3 fragments were the only choices.

Quick exit is supposed to be now the default behaviour in the coming commits

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/res/values-or/strings.xml

@@ -13,7 +13,6 @@
     <string name="pref_ui_theme_dark">ଗାଢ଼</string>
     <string name="pref_ui_theme_title">ଥିମ୍</string>
     <string name="pref_ui_theme_system">ସିଷ୍ଟମ୍‍କୁ ଅନୁସରଣ କରିବା</string>
-    <string name="pref_ui_quick_exit">ଦ୍ରୁତ ପ୍ରସ୍ଥାନ</string>
     <string name="pref_ui_theme_light">ହାଲୁକା</string>
     <string name="details_description">ଵର୍ଣ୍ଣନା</string>
     <string name="details_dev_profile">ଡେଵେଲପର୍ ପ୍ରୋଫାଇଲ୍</string>