Fixed mobile phonebook import styles

Closes #550

app/css/mobile.css

@@ -1118,3 +1118,8 @@ a.mobile_modal_action .tg_checkbox_label {
 .countries_scrollable_wrap a.countries_modal_country {
   padding: 8px 8px;
 }
+
+.import_modal_phonebook_wrap {
+  margin-top: 40px;
+  text-align: center;
+}

app/partials/mobile/import_contact_modal.html

@@ -28,7 +28,7 @@
 
   <div class="modal-body">
 
-    <form class="modal_simple_form" ng-submit="doImport()" my-vertical-position="0.3">
+    <form class="modal_simple_form" ng-submit="doImport()" my-vertical-position="0.2">
 
       <div class="form-group">
         <input class="form-control input-lg" my-focused type="text" placeholder="{{'contact_import_modal_phone' | i18n}}" ng-model="importContact.phone"/>
@@ -40,12 +40,11 @@
         <input class="form-control input-lg" type="text" placeholder="{{'contact_edit_modal_last_name' | i18n}}" ng-model="importContact.last_name"/>
       </div>
       
-    </form>
-
-  </div>
-
-  <div class="modal-footer" ng-if="phonebookAvailable">
+      <div class="import_modal_phonebook_wrap" ng-if="phonebookAvailable">
         <a class="btn btn-link" ng-click="importPhonebook()" my-i18n="contact_import_modal_phonebook"></a>
       </div>
 
+    </form>
+
+  </div>
 </div>