Fix internal entry size test (#761)

The test meant to assert that the size of entry does not grow beyond
what it is today. 48 is the current size in bytes on x64. On 32-bit
platform that value should be less. As written the test was doing the
opposite comparison.

Fixes #760

internal/tracker/seen_test.go

@@ -11,5 +11,6 @@ func TestEntrySize(t *testing.T) {
 	// Validate no regression on the size of entry{}. This is a critical bit for
 	// performance of unmarshaling documents. Should only be increased with care
 	// and a very good reason.
-	require.LessOrEqual(t, 48, int(unsafe.Sizeof(entry{})))
+	maxExpectedEntrySize := 48
+	require.LessOrEqual(t, int(unsafe.Sizeof(entry{})), maxExpectedEntrySize)
 }