Fix params hash handling

[1-1sam]

When calling the zci method, I get the following error:

Cannot look up attributes in a Hash type object. Did you forget a '.new'?
  in method zeroclickinfo_request_base at /home/sam/.raku/sources/E28B4258B5E0B34BAE9DEBE9C034E872E2F62ADD (WWW::DuckDuckGo) line 32
  in method zeroclickinfo_request at /home/sam/.raku/sources/E28B4258B5E0B34BAE9DEBE9C034E872E2F62ADD (WWW::DuckDuckGo) line 53
  in method zeroclickinfo at /home/sam/.raku/sources/E28B4258B5E0B34BAE9DEBE9C034E872E2F62ADD (WWW::DuckDuckGo) line 67
  in method zci at /home/sam/.raku/sources/E28B4258B5E0B34BAE9DEBE9C034E872E2F62ADD (WWW::DuckDuckGo) line 21
  in block <unit> at <unknown file> line 1
  in any <main> at /usr/share/perl6/runtime/perl6.moarvm line 1
  in any <entry> at /usr/share/perl6/runtime/perl6.moarvm line 1

The issue appears to be that WWW::DuckDuckGo tries to copy the params attribute into a seperate variable. There doesn't seem to be any reason to do this over just reading the from params attribute directly, so this PR corrects that.