Revert "Fix syntax roundtrip tests (rescript-lang#7092)"

This reverts commit 0e02681.

Author: cknitt

scripts/test_syntax.sh

@@ -8,7 +8,9 @@
 scriptDir=`dirname $0`
 # macOS 12 does not have the realpath utility,
 # so let's use this workaround instead.
-DUNE_BIN_DIR=`cd "$scriptDir/../compiler/_build/install/default/bin"; pwd -P`
+DUNE_BIN_DIR=`cd "$scriptDir/../_build/install/default/bin"; pwd -P`
+
+$DUNE_BIN_DIR/syntax_tests
 
 function exp {
   echo "$(dirname $1)/expected/$(basename $1).txt"