Remove "--force" feature-dud

Seems like it was never realized (saturnin-ln would always remove the
target first)

src/libexec/saturnin-ln

@@ -6,7 +6,6 @@ ffoo import pretty
 
 DEFAULT_TARGET=$HOME
 TRY_RELPATH=true
-FORCE=false
 
 PY_SCRIPT="
 import os.path
@@ -21,7 +20,7 @@ else:
 "
 
 usage() {
-    usage_is "[-f|--force] [-t|--target TARGET] [SOURCE] [NAME]"
+    usage_is "[-t|--target TARGET] [SOURCE] [NAME]"
 }
 
 expand_tilde() {
@@ -66,7 +65,6 @@ load() {
 }
 
 while true; do case $1 in
-    -f|--force)         FORCE=true;         shift   ;;
     -t|--target)        target=$2           shift 2 ;;
     --help)             usage                       ;;
     -*)                 usage                       ;;