Fix optimizer TO_BOOL_STR

Author: fluhus

Python/optimizer_bytecodes.c

@@ -432,9 +432,6 @@ dummy_func(void) {
     }
 
     op(_TO_BOOL_STR, (value -- res)) {
-        if (sym_matches_type(value, &PyUnicode_Type)) {
-            REPLACE_OP(this_instr, _NOP, 0, 0);
-        }
         if (!optimize_to_bool(this_instr, ctx, value, &res)) {
             res = sym_new_truthiness(ctx, value, true);
             sym_set_type(value, &PyUnicode_Type);