[CLEANUP] Reformat the code a bit (#816)

With the latest version of PHP_CodeSniffer, we can have boolean operators
in the middle of a line as well. This allows us more liberties with code
formatting in order to make to the code more readable.

tests/Unit/CssInlinerTest.php

@@ -1621,17 +1621,13 @@ public function orderedRulesAndSurroundingCssDataProvider(): array
                     // every combination would be a ridiculous c.1000 datasets - choose a select few
                     // test all possible CSS before once
                     if (
-                        ($cssBetween === ''
-                            && $cssAfter === '')
+                        ($cssBetween === '' && $cssAfter === '')
                         // test all possible CSS between once
-                        || ($cssBefore === ''
-                            && $cssAfter === '')
+                        || ($cssBefore === '' && $cssAfter === '')
                         // test all possible CSS after once
-                        || ($cssBefore === ''
-                            && $cssBetween === '')
+                        || ($cssBefore === '' && $cssBetween === '')
                         // test with each possible CSS in all three positions
-                        || ($cssBefore === $cssBetween
-                            && $cssBetween === $cssAfter)
+                        || ($cssBefore === $cssBetween && $cssBetween === $cssAfter)
                     ) {
                         $description = ' with ' . $descriptionBefore . ' before, '
                             . $descriptionBetween . ' between, '