archiveprefix - trim extracted value

Should fix
```
[2021-10-18 17:44:38] cluebot3.INFO: doarchive(Talk:Tao, Talk:Tao/Archive, %%i, 2160, 2, 5, {{Automatic archive navigator}},{{User:ClueBot III/ArchiveNow}},2,0,0,0,, 75000, 4,) [] []
[2021-10-18 17:44:39] cluebot3.ERROR: listprefix API Error: array (   'code' => 'badvalue',   'info' => 'Unrecognized value for parameter "apnamespace": .',   '*' => 'See https://en.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/postorius/lists/mediawiki-api-announce.lists.wikimedia.org/> for notice of API deprecations and breaking changes.', ) [] []
```

Which is being extracted as
```
array(2) {
  [0]=>
  string(5) " Talk"
  [1]=>
  string(11) "Tao/Archive"
}

```

And thus returns a blank string for the namespace.

lib/bot.php

@@ -605,7 +605,7 @@ function parsetemplate($page)
         // {{User:ClueBot III/ArchiveThis|archiveprefix=Talk:Parkinson's law/Archives/}}
         // Ensure we decode the HTML entries back to normal characters,
         // otherwise when we url encode this it becomes a complete mess
-        $set['archiveprefix'] = html_entity_decode($set['archiveprefix'], ENT_QUOTES);
+        $set['archiveprefix'] = ltrim(html_entity_decode($set['archiveprefix'], ENT_QUOTES));
 
         $logger->addInfo('doarchive(' . $page . ','
             . $set['archiveprefix'] . ','