Fix syling of long labels in modal

Our forms use a fixed width per default, for nice alignment of multiple
form field. This is not neccessary on single-field preference forms.
Mantis: 3827

lib/NGCP/Panel/Form/Preferences.pm

@@ -19,7 +19,7 @@ has 'fields_data' => (is => 'rw');
 
 has_block 'fields' => (
     tag => 'div',
-    class => [qw/modal-body/],
+    class => [qw/modal-body ngcp-modal-preferences/],
 );
 
 sub field_list {

share/static/css/main.css

@@ -329,6 +329,15 @@ div.ngcp-modal .control-group.error .dataTables_wrapper input[type="text"] {
 	text-decoration: line-through;
 }
 
+.ngcp-modal-preferences .control-group .control-label {
+    width: auto;
+    padding-right: 10px;
+}
+
+.ngcp-modal-preferences .control-group .controls {
+    overflow: hidden;
+}
+
 /* ---------
   Widgets
 ------------*/