Do not show any string next to clock on offers.

Due to a bug passing the string argument to #link_to, said string didn't
show up in the page. The way is written now, it shows, so we need to
hide it to be consistent.

Author: sauloperez

app/views/users/show.html.erb

@@ -96,7 +96,6 @@
               <% if @user != current_user %>
                 <%= link_to give_time_user_path(@user, offer: post.id) do %>
                   <%= glyph :time %>
-                  <%= t "global.give_time" %>
                 <% end %>
               <% end %>
             </div>