[Tests][Wasm] Fix excessively long test output directory

Fix small mistake to drastically shorten path length of temporary folder.
On Windows, file paths must not exceed 260 symbols.

^KT-80996

wasm/wasm.tests/testFixtures/org/jetbrains/kotlin/wasm/test/handlers/AbstractWasmArtifactsCollector.kt

diff --git a/wasm/wasm.tests/testFixtures/org/jetbrains/kotlin/wasm/test/handlers/AbstractWasmArtifactsCollector.kt b/wasm/wasm.tests/testFixtures/org/jetbrains/kotlin/wasm/test/handlers/AbstractWasmArtifactsCollector.kt
index b80d93b..7215134 100644
--- a/wasm/wasm.tests/testFixtures/org/jetbrains/kotlin/wasm/test/handlers/AbstractWasmArtifactsCollector.kt
+++ b/wasm/wasm.tests/testFixtures/org/jetbrains/kotlin/wasm/test/handlers/AbstractWasmArtifactsCollector.kt
@@ -113,7 +113,7 @@
     val pathToTestDir = allDirectives[WasmEnvironmentConfigurationDirectives.PATH_TO_TEST_DIR].first()
 
     val testGroupOutputDir = File(File(pathToRootOutputDir, "out"), testGroupDirPrefix)
-    val stopFile = File(pathToTestDir)
+    val stopFile = File(pathToTestDir).absoluteFile
     return generateSequence(originalFile.parentFile) { it.parentFile }
         .takeWhile { it != stopFile }
         .map { it.name }