Use absolute path to the project in test in AS 4.2

It seems like sometimes by some reason here used relative path, but
also seems like corresponding function prefer absolute path.
Without it tests failing (for example ConfigureKotlinTest)

Author: erokhins

idea/tests/org/jetbrains/kotlin/idea/configuration/AbstractConfigureKotlinTest.kt.as42

@@ -111,7 +111,7 @@ abstract class AbstractConfigureKotlinTest : PlatformTestCase() {
     }
 
     override fun doCreateProject(projectFile: Path): Project {
-        return (ProjectManagerEx.getInstanceEx()).loadProject(projectFile)
+        return (ProjectManagerEx.getInstanceEx()).loadProject(projectFile.toAbsolutePath())
     }
 
     private val projectName: String