linting: ST1017: don't use Yoda conditions (stylecheck)

opts/envfile_test.go:157:5: ST1017: don't use Yoda conditions (stylecheck)
        if 1 != len(variables) {
           ^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

opts/envfile_test.go

@@ -154,7 +154,7 @@ HOME
 		t.Fatal("the HOME variable is not properly imported as the first variable (but it is the only one to import)")
 	}
 
-	if 1 != len(variables) {
+	if len(variables) != 1 {
 		t.Fatal("exactly one variable is imported (as the other one is not set at all)")
 	}
 }