Update Leaflet.contextmenu to the 1.2.1 release

Vendorfile

@@ -20,7 +20,7 @@ folder 'vendor/assets' do
       file "images/#{image}", "https://unpkg.com/leaflet@1.0.3/dist/images/#{image}"
     end
 
-    from 'git://github.com/aratcliffe/Leaflet.contextmenu.git' do
+    from 'git://github.com/aratcliffe/Leaflet.contextmenu.git', :tag => 'v1.2.1' do
       file 'leaflet.contextmenu.js', 'dist/leaflet.contextmenu.js'
       file 'leaflet.contextmenu.css', 'dist/leaflet.contextmenu.css'
     end

vendor/assets/leaflet/leaflet.contextmenu.css

@@ -1,14 +1,14 @@
 .leaflet-contextmenu {
     display: none;
-	box-shadow: 0 1px 7px rgba(0,0,0,0.4);
-	-webkit-border-radius: 4px;
-	border-radius: 4px;
+    box-shadow: 0 1px 7px rgba(0,0,0,0.4);
+    -webkit-border-radius: 4px;
+    border-radius: 4px;
     padding: 4px 0;
     background-color: #fff;
     cursor: default;
-	-webkit-user-select: none;
-	-moz-user-select: none;
-	user-select: none;
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    user-select: none;
 }
 
 .leaflet-contextmenu a.leaflet-contextmenu-item {
@@ -51,4 +51,4 @@
 .leaflet-contextmenu-separator {
     border-bottom: 1px solid #ccc;
     margin: 5px 0;
-}
+}