UI: use different padding in labels for Issues#show and Issues#index

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/issues.scss

@@ -125,7 +125,7 @@ input.check_all_issues {
   max-width: 200px;
 }
 
-.issue-labels .label {
+.issue-show-labels .label {
   padding: 6px 10px;
 }
 

app/views/projects/issues/show.html.haml

@@ -64,7 +64,7 @@
   - @issue.participants.each do |participant|
     = link_to_member(@project, participant, name: false, size: 24)
 
-  .issue-labels.pull-right
+  .issue-show-labels.pull-right
     - @issue.labels.each do |label|
       %span{class: "label #{label_css_class(label.name)}"}
         %i.icon-tag