Use HTTP body instead of header for setting flows run state

packages/node_modules/@node-red/editor-api/lib/admin/flows.js

@@ -83,7 +83,7 @@ module.exports = {
     postState: function(req,res) {
         const opts = {
             user: req.user,
-            requestedState: req.get("Node-RED-Flow-Run-State-Change")||"",
+            requestedState: req.body.state||"",
             req: apiUtils.getRequestLogObject(req)
         }
         runtimeAPI.flows.setState(opts).then(function(result) {

packages/node_modules/@node-red/editor-client/src/js/ui/deploy.js

@@ -306,10 +306,7 @@ RED.deploy = (function() {
         $.ajax({
             url:"flows/state",
             type: "POST",
-            data: {state: state},
-            headers: {
-                "Node-RED-Flow-Run-State-Change": state
-            }
+            data: {state: state}
         }).done(function(data,textStatus,xhr) {
             if (deployWasEnabled) {
                 $("#red-ui-header-button-deploy").removeClass("disabled");