workspace.rb: one more space

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60897 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/irb/workspace.rb

@@ -119,7 +119,7 @@ EOF
       start_pos = [pos - 5, 0].max
       end_pos   = [pos + 5, lines.size - 1].min
 
-      fmt = "%2s %#{end_pos.to_s.length}d: %s"
+      fmt = " %2s %#{end_pos.to_s.length}d: %s"
       body = (start_pos..end_pos).map do |current_pos|
         sprintf(fmt, pos == current_pos ? '=>' : '', current_pos + 1, lines[current_pos])
       end.join("")