debug: support for 'type' in SetVariableResponse

fixes #13881

src/vs/workbench/parts/debug/common/debugModel.ts

@@ -298,6 +298,7 @@ export class Variable extends ExpressionContainer implements debug.IExpression {
 		}).then(response => {
 			if (response && response.body) {
 				this.value = response.body.value;
+				this.type = response.body.type || this.type;
 			}
 			// TODO@Isidor notify stackFrame that a change has happened so watch expressions get revelauted
 		}, err => {