Added semiauto subnet range changer for existing clients

If the same subnet range is selected, a different IP is suggested

templates/base.html

@@ -616,7 +616,7 @@
                 $("#client_preshared_key").val("");
                 $("#client_allocated_ips").importTags('');
                 $("#client_extra_allowed_ips").importTags('');
-                updateSubnetRangesList();
+                updateSubnetRangesList("#subnet_ranges");
                 updateIPAllocationSuggestion(true);
             });
         });