Fix SnipQuotedTestCase.test_quote_1 for newer flake8
hyperkitty/tests/test_templatetags.py: Fix SnipQuotedTestCase.test_quote_1 for newer flake8, which detects its expected string as too long. Use a properly indendet string and format it using dedent when comparing.
After merging !454 (merged) a new version of flake8 has been pulled in which introduced differing behavior and broke the qa tox target.