fix rm to handle multiple files

Author: Rich Whitcroft

lib/rex/post/meterpreter/ui/console/command_dispatcher/stdapi/fs.rb

@@ -309,15 +309,15 @@ def cmd_checksum_tabs(str, words)
   end
 
   #
-  # Delete the specified file.
+  # Delete the specified file(s).
   #
   def cmd_rm(*args)
     if (args.length == 0)
-      print_line("Usage: rm file")
+      print_line("Usage: rm file1 [file2...]")
       return true
     end
 
-    client.fs.file.rm(args[0])
+    args.each { |f| client.fs.file.rm(f) }
 
     return true
   end