Minor. Fix tests after CoroutineContext introduction

Original commit: c7f76d7ec8

jps/jps-plugin/testData/incremental/inlineFunCallSite/coroutine/usage.kt

@@ -4,6 +4,7 @@ import kotlin.coroutines.intrinsics.*
 
 fun async(x: suspend Controller.() -> Unit) {
     x.startCoroutine(Controller(), object : Continuation<Unit> {
+        override val context: CoroutineContext = null!!
         override fun resume(value: Unit) {}
 
         override fun resumeWithException(exception: Throwable) {}