Fix HAML in profiles/keys/index.html.haml

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/views/profiles/keys/index.html.haml

@@ -19,6 +19,6 @@
     = render 'form'
     %hr
     %h5
-      = _('Your SSH keys (%{count})') % { count:@keys.count }
+      = _('Your SSH keys (%{count})') % { count: @keys.count }
     .gl-mb-3
       = render 'key_table'