Don't use variable before declaration

Author: KitaitiMakoto

bindings/ruby/lib/whisper/model/uri.rb

@@ -94,7 +94,8 @@ def download(response)
       end
 
       def show_progress(current, size)
-        progress_rate_available = size && $stderr.tty? && $stderr.winsize[1] >= line.size
+        line_size = 47
+        progress_rate_available = size && $stderr.tty? && $stderr.winsize[1] >= line_size
 
         unless @prev
           @prev = Time.now