Remove keys file after use

src/freedombone-config

@@ -300,6 +300,7 @@ function reconstruct_key {
         rm -rf /home/$MY_USERNAME/.tempgnupg
         exit 9654
     fi
+    shred -zu $KEYS_FILE
 
     dialog --title "Encryption keys" --msgbox 'Key has been reconstructed' 6 70
 }