Remove DAFFODIL_HOME since IDEs don't need it

- remove daffodilRoot, which uses DAFFODIL_HOME, as replacing it with "." is essentially a no-op in the Paths.get function

DAFFODIL-2836

daffodil-cli/src/test/scala/org/apache/daffodil/cli/cliTest/Util.scala

@@ -52,11 +52,9 @@ object Util {
 
   private val isWindows = System.getProperty("os.name").toLowerCase().startsWith("windows")
 
-  private val daffodilRoot = sys.env.getOrElse("DAFFODIL_HOME", ".")
-
   private val daffodilBinPath = {
     val ext = if (isWindows) ".bat" else ""
-    Paths.get(daffodilRoot, s"daffodil-cli/target/universal/stage/bin/daffodil$ext")
+    Paths.get(s"daffodil-cli/target/universal/stage/bin/daffodil$ext")
   }
 
   /**
@@ -67,7 +65,7 @@ object Util {
    * operating system
    */
   def path(string: String): Path = {
-    Paths.get(daffodilRoot, string)
+    Paths.get(string)
   }
 
   def devNull(): String = if (isWindows) "NUL" else "/dev/null"