simplify the toolchain target_settings

Author: aignas

python/private/py_toolchain_suite.bzl

@@ -88,13 +88,7 @@ def py_toolchain_suite(*, prefix, user_repository_name, python_version, set_pyth
             visibility = ["//visibility:private"],
         )
 
-        if set_python_version_constraint == "True":
-            target_settings = [name]
-        else:
-            target_settings = select({
-                name: [name],
-                "//conditions:default": [],
-            })
+        target_settings = [name]
     else:
         fail(("Invalid set_python_version_constraint value: got {} {}, wanted " +
               "either the string 'True' or the string 'False'; " +