tests: Fix one of the tests for slower machines
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FAIL: test_intel_pstate_balance (__main__.Tests)
Intel P-State driver (balance)
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Traceback (most recent call last):
File "/builddir/build/BUILD/power-profiles-daemon-0.1/tests/integration-test", line 375, in test_intel_pstate_balance
self.assertEqual(contents, b'balance_power')
AssertionError: b'' != b'balance_power'
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