Display transform on the SF traces

The transform flicker object doesn't have a "isNotEmpty" property
(return undefined) and was being ignored. Instead check if
object.isEmpty === true to allow objects without a isNotEmpty
property to be displayed

Bug: 176906864
Test: compile winscope, take a SF trace, check if the layers have a
trasnform property
Change-Id: Ia466dd6b5e9f5e08fad515d31122206b6bd9898a

tools/winscope/src/flickerlib/ObjectFormatter.ts

@@ -88,7 +88,8 @@ export default class ObjectFormatter {
             if (value || (this.displayDefaults && value !== undefined && value !== null)) {
                 // flicker obj
                 if (value.prettyPrint) {
-                    if (value.isNotEmpty || this.displayDefaults) {
+                    const isEmpty = value.isEmpty === true;
+                    if (!isEmpty || this.displayDefaults) {
                         result[key] = value.prettyPrint()
                     }
                 } else {