Simplify unittest caller

Author: gnikit

fortls.py

@@ -1,10 +1,6 @@
 #!/usr/bin/env python3
+# file used for unit testing
 if __name__ == "__main__":
-    import sys
-    import os
-
-    root_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
-    sys.path.insert(0, root_dir)
     import fortls
 
     fortls.main()