Merge #12475: qa: Fix python TypeError in script.py

fa41d68a2 qa: Fix python TypeError in script.py (MarcoFalke)

Pull request description:

  `__repr__` returns string, so don't mix it with byte strings.

  This fixes

  ```
  TypeError: %b requires a bytes-like object, or an object that implements __bytes__, not 'str'

Tree-SHA512: fac06e083f245209bc8a36102217580b0f6186842f4e52a686225111b0b96ff93c301640ff5e7ddef6a5b4f1689071b16a9a8dc80f28e2b060ddee29edd24ec7

test/functional/test_framework/script.py

@@ -526,11 +526,9 @@ class CScript(bytes):
                     yield CScriptOp(opcode)
 
     def __repr__(self):
-        # For Python3 compatibility add b before strings so testcases don't
-        # need to change
         def _repr(o):
             if isinstance(o, bytes):
-                return b"x('%s')" % hexlify(o).decode('ascii')
+                return "x('%s')" % hexlify(o).decode('ascii')
             else:
                 return repr(o)