Hygiene: replace deepEqual tests with propEqual

Replace QUnit deepEqual() assertions with propEqual(). The former is a
recursive == check, the latter is a recursive === check which seems
preferable.

  find tests -name \*.js|
  xargs -rd\\n sed -ri 's%deepEqual%propEqual%g'

Change-Id: I977244d24c47072cc62b7d9fc797505a5f39aa54

tests/qunit/skins.minerva.scripts/pageIssues.test.js

@@ -97,22 +97,22 @@
 				MEDIUM_ISSUE
 			]
 		};
-		assert.deepEqual(
+		assert.propEqual(
 			getAllIssuesSections( allIssuesOldTreatment ),
 			[ '0', '0', '0' ],
 			'section numbers correctly extracted from old treatment'
 		);
-		assert.deepEqual(
+		assert.propEqual(
 			getAllIssuesSections( allIssuesNewTreatment ),
 			[ '0', '0', '0', '1' ],
 			'section numbers correctly extracted from new treatment'
 		);
-		assert.deepEqual(
+		assert.propEqual(
 			getAllIssuesSections( multipleIssues ),
 			[ '0' ],
 			'multiple issues are packed into one entry since there is one box'
 		);
-		assert.deepEqual(
+		assert.propEqual(
 			getAllIssuesSections( multipleIssuesWithDeletion ),
 			[ '0', '0' ],
 			'while multiple issues are grouped, non-multiple issues are still reported'