Fix parameter matching

The original regexes would match inside other arguments;

Eg.

    mkexec foo-foo

would match as if -f was presented.

bin/mkexec

@@ -22,9 +22,9 @@ my $edit = $DEFAULT_EDIT;
 my $name; my $type; my $purpose;
 
 foreach (@ARGV) {
-    if (m/-f|--force/) {
+    if (m/\b-f\b|\b--force\b/) {
         $force++;
-    } elsif (m/-e|--edit/) {
+    } elsif (m/\b-e\b|\b--edit\b/) {
         $edit++;
     } elsif (defined $type) {
         $purpose = $_;