`(basilisp.test/is (= act expr)` evaluates its arguments twice on failure

[ikappaki]

Hi,

(is (= act expr) evaluates its act and exprtwice when the expression is not equal, that might cause additional side effects on tests.

To reproduce,

1. Open up a REPL
2. Create a test with a (println :5) argument to = that fails the equation, it prints :5 out twice, while it should only pint it out only once

(deftest issue
                    (is (= 8 (println :5))))
#'basilisp.user/issue

basilisp.user=> (issue)
:5
:5
{:failures [{:message "Test failure: (= 8 (println :5))" :test-name "issue" :line 2 :expected 8 :type :failure :expr (= 8 (println :5)) :actual nil :test-section nil}]}

PR to follow