Tweak severity shown in IDE

We used to be able to specify severity "3" in .eslintrc for these,
but the new eslint no longer allows this :(

package.json

@@ -66,7 +66,7 @@
         "c9.ide.language.html.diff": "#7d6cecfb90",
         "c9.ide.language.javascript": "#a5c1d05394",
         "c9.ide.language.javascript.immediate": "#82c426dbca",
-        "c9.ide.language.javascript.eslint": "#1bdffa204a",
+        "c9.ide.language.javascript.eslint": "#66c856d7ce",
         "c9.ide.language.javascript.tern": "#0545a6385d",
         "c9.ide.language.javascript.infer": "#b9c2e4bdb8",
         "c9.ide.language.jsonalyzer": "#a0549e14ff",