Clean find_first2 specs

Author: jvazquez-r7

spec/lib/msf/core/exploit/smb/server/share/command/trans2/find_first2_spec.rb

@@ -18,20 +18,12 @@
   let(:client_string) { '' }
   let(:client) { StringIO.new(client_string) }
 
-  let(:valid_find_file_names_info_request) do
-    ""
-  end
-
   let(:valid_find_file_both_directory_info_params) do
     "\x16\x00\x56\x05\x07\x00\x04\x01\x00\x00\x00\x00\x5c\x00\x74\x00" +
     "\x65\x00\x73\x00\x74\x00\x2e\x00\x65\x00\x78\x00\x65\x00\x00\x00"
   end
   let(:find_file_both_directory_info_res_length) { 179 }
 
-  let(:valid_find_file_full_directory_info_request) do
-    ""
-  end
-
   before(:each) do
     mod.instance_variable_set('@state', {
       client => {