Change tab casing to be consistent with other whiptail prompts

setup/so-whiptail

@@ -475,7 +475,7 @@ whiptail_end_settings() {
 	read -r -d '' msg <<-EOM
 	$end_msg
 
-	Press the Tab key to select yes or no.
+	Press the TAB key to select yes or no.
 	EOM
 
 	whiptail --title "The following options have been set, would you like to proceed?" --yesno "$msg" 24 75 --scrolltext