bitbake: toaster: layerBtn avoid connecting handler to other build buttons

Some pages contain other build buttons which may have the same class
attached. Make sure that we only select the buttons in the tables where
layerBtn is used.

[YOCTO #9841]

(Bitbake rev: ec083fd943c6996307beb3be3421403870d2f2b7)

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/static/js/layerBtn.js

@@ -55,8 +55,8 @@ function layerBtnsInit() {
     });
   });
 
-  $(".build-recipe-btn").unbind('click');
-  $(".build-recipe-btn").click(function(e){
+  $("td .build-recipe-btn").unbind('click');
+  $("td .build-recipe-btn").click(function(e){
     e.preventDefault();
     var recipe = $(this).data('recipe-name');