Revert "Run dotty tests with the correct baseDirectory"

This reverts commit 1b19afa.

Author: OlivierBlanvillain

project/Build.scala

@@ -495,10 +495,8 @@ object Build {
         "org.scala-lang" % "scala-library" % scalacVersion % "test"
       ),
 
-      // For convenience, change the baseDirectory when running the compiler
-      baseDirectory in (Compile, run) := baseDirectory.value / "..",
-      // .. but not when running test
-      baseDirectory in (Test, run) := baseDirectory.value,
+      // Set run baseDir to be root of project, makes dotc saner
+      baseDirectory in run := baseDirectory.value / "..",
 
       test in Test := {
         // Exclude legacy tests by default