Autoload hotfuzz--adjust-metadata

An all-completions operation will call the autoloaded function
hotfuzz-all-completions, and as such hotfuzz--adjust-metadata gets
defined before it is subsequently called. However, for try-completion
operations hotfuzz piggybacks on the built-in function
completion-flex-try-completion, and so will not be automatically
loaded. This commit fixes this by also autoloading
hotfuzz--adjust-metadata.

An alternative would have been defining an autoloaded alias for
completion-flex-try-completion, which, though exposing a redundant
symbol, would avoid autoloading a "private" function.

hotfuzz.el

@@ -168,6 +168,7 @@ list before passing it to `display-sort-function' or
         (setcar all (propertize (car all) 'completion-sorted t)))
       (if (string= prefix "") all (nconc all (length prefix))))))
 
+;;;###autoload
 (defun hotfuzz--adjust-metadata (metadata)
   "Adjust completion METADATA for hotfuzz sorting."
   (let ((existing-dsf (completion-metadata-get metadata 'display-sort-function))