Fix wrong calls in text_fixers.py for 2to3

Fix wrong calls in text_fixers.py for 2to3 · python/cpython@b120ca0

Original file line number	Diff line number	Diff line change
`@@ -3036,7 +3036,7 @@ class Test_map(FixerTestCase):`
`3036`	`3036`	`fixer = "map"`
`3037`	`3037`
`3038`	`3038`	`def check(self, b, a):`
`3039`		`-self.unchanged("from future_builtins import map; " + b, a)`
	`3039`	`+self.unchanged("from future_builtins import map; " + b)`
`3040`	`3040`	`super(Test_map, self).check(b, a)`
`3041`	`3041`
`3042`	`3042`	`def test_prefix_preservation(self):`
`@@ -3160,7 +3160,7 @@ class Test_zip(FixerTestCase):`
`3160`	`3160`	`fixer = "zip"`
`3161`	`3161`
`3162`	`3162`	`def check(self, b, a):`
`3163`		`-self.unchanged("from future_builtins import zip; " + b, a)`
	`3163`	`+self.unchanged("from future_builtins import zip; " + b)`
`3164`	`3164`	`super(Test_zip, self).check(b, a)`
`3165`	`3165`
`3166`	`3166`	`def test_zip_basic(self):`