Use padding like most of other bootstrap elements

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

app/assets/stylesheets/generic/lists.scss

@@ -8,7 +8,7 @@
   list-style: none;
 
   li {
-    padding: 10px;
+    padding: 10px 15px;
     min-height: 20px;
     border-bottom: 1px solid #eee;
     border-bottom: 1px solid rgba(0, 0, 0, 0.05);

app/assets/stylesheets/sections/dashboard.scss

@@ -60,7 +60,7 @@
 }
 
 .project-row, .group-row {
-  padding: 8px 12px !important;
+  padding: 8px 15px !important;
   font-size: 14px;
   line-height: 24px;
 
@@ -74,7 +74,6 @@
 
   .arrow {
     float: right;
-    padding: 0px 5px;
     margin: 0;
     font-size: 20px;
     color: #666;

app/assets/stylesheets/sections/issues.scss

@@ -1,6 +1,6 @@
 .issues-list {
   .issue {
-    padding: 10px;
+    padding: 10px 15px;
     position: relative;
 
     .issue-title {
@@ -42,7 +42,7 @@
   height: 32px;
   float: left;
   margin-right: 12px;
-  padding: 6px 10px;
+  padding: 6px 15px;
   border: 1px solid #ccc;
   @include border-radius(4px);
 }

app/assets/stylesheets/sections/merge_requests.scss

@@ -70,7 +70,7 @@
 
 .mr-list {
   .merge-request {
-    padding: 10px;
+    padding: 10px 15px;
     position: relative;
 
     .merge-request-title {