Fix ignored test

Author: topecongiro

rustfmt-core/rustfmt-bin/tests/rustfmt/main.rs

@@ -91,10 +91,11 @@ fn inline_config() {
             "--config",
             "max_width=80,edition=2018",
             "--config",
-            "color=always,format_strings=true"
+            "tab_spaces=8,format_strings=true"
         ],
         contains("max_width = 80")
             && contains("edition = \"2018\"")
             && contains("format_strings = true")
+            && contains("tab_spaces = 8")
     );
 }