Revert "Mute flaky test.io.FileTreeWalkTest.withDirectoryFilter"

This reverts commit 7c5588c.

 #KT-79735

Author: 4u7

tests/mute-common.csv

@@ -5,5 +5,4 @@ org.jetbrains.kotlin.konan.test.diagnostics.DiagnosticsNativeTestGenerated.Multi
 org.jetbrains.kotlin.konan.test.diagnostics.DiagnosticsNativeTestGenerated.Multiplatform.testObjCOutlet_expectAnnotation,,STABLE
 org.jetbrains.kotlin.konan.test.diagnostics.DiagnosticsNativeTestGenerated.Multiplatform.testOverrideInit_expectAnnotation,,STABLE
 org.jetbrains.kotlinx.serialization.runners.SerializationJdk11IrBoxTestGenerated.testSerializableOnJavaClass,KT-79735,FLAKY
-org.jetbrains.kotlinx.serialization.runners.SerializationJdk11FirLightTreeBoxTestGenerated.testSerializableOnJavaClass,KT-79735,FLAKY
-test.io.FileTreeWalkTest.withDirectoryFilter,KTI-2696,FLAKY
+org.jetbrains.kotlinx.serialization.runners.SerializationJdk11FirLightTreeBoxTestGenerated.testSerializableOnJavaClass,KT-79735,FLAKY