fix(themes): bump example-theme.json to schemaVersion 2

HellionChat/Themes/Builtin/example-theme.json

@@ -1,5 +1,5 @@
 {
-    "schemaVersion": 1,
+    "schemaVersion": 2,
     "slug": "example-custom",
     "name": "Example Custom",
     "author": "You",
@@ -37,5 +37,9 @@
         "scrollbarRounding": 2,
         "windowBorderSize": 1,
         "frameBorderSize": 1
+    },
+    "typography": {
+        "overrideGlobalFontSizePt": null,
+        "overrideSymbolsFontSizePt": null
     }
 }