Reword screen and use echo instead of tail with user interaction

Based on an example provided by #76.

_gtfobins/screen.md

@@ -3,18 +3,14 @@ functions:
   shell:
     - code: screen
   file-write:
-    - description: This has been found working on screen version 4.06.02. The file has a trailing `^C` character.
+    - description: This works on screen version 4.06.02. Data is appended to the file and `\n` is converted to `\r\n`.
       code: |
         LFILE=file_to_write
-        screen -L -Logfile $LFILE tail -f /dev/null
+        screen -L -Logfile $LFILE echo DATA
-        DATA
+    - description: This works on screen version 4.05.00. Data is appended to the file and `\n` is converted to `\r\n`.
-        ^C
-    - description: This has been found working on screen version 4.05.00. The file has a trailing `^C` character.
       code: |
         LFILE=file_to_write
-        screen -L $LFILE tail -f /dev/null
+        screen -L $LFILE echo DATA
-        DATA
-        ^C
   sudo:
     - code: sudo screen
 ---