bitbake: toaster: disable add layer button on click

The 'add layer' button in the project configuration page remains enabled
after you add a layer. If you click it again, the same layer you just
added is added again.

This patch disables the 'add layer' button on click, to avoid this bit
of weirdness.

[YOCTO #8905]

(Bitbake rev: 63705f60035884a810fdd36e5a3fe10e411f23c7)

Signed-off-by: Belen Barros Pena <belen.barros.pena@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/projectpage.js

@@ -116,6 +116,8 @@ function projectPageInit(ctx) {
     addRmLayer(layerObj, true);
     /* Reset the text input */
     layerAddInput.val("");
+    /* Disable the add layer button*/
+    layerAddBtn.attr("disabled", "disabled");
   });
 
   function addRmLayer(layerObj, add){