Fix issue 529 - Grid responsive does not work in vue3 (jbaysolutions#530)

Author: ygj6

src/components/GridLayout.vue

@@ -249,7 +249,7 @@
             },
             responsive() {
                 if (!this.responsive) {
-                    this.$emit('layout-updated', this.originalLayout);
+                    this.$emit('update:layout', this.originalLayout);
                     this.eventBus.emit("setColNum", this.colNum);
                 }
                 this.onWindowResize();
@@ -432,7 +432,7 @@
                 }
 
                 // new prop sync
-                this.$emit('layout-updated', layout);
+                this.$emit('update:layout', layout);
 
                 this.lastBreakpoint = newBreakpoint;
                 this.eventBus.emit("setColNum", getColsFromBreakpoint(newBreakpoint, this.cols));