chore: use spaces for JSON indent in plot graph defaults

Align defaults.json with EditorConfig (*.{json}: indent_style space, indent_size 2).

Made-with: Cursor

Author: GuneetGill

lib/node_modules/@stdlib/plot/components/svg/graph/lib/defaults.json

@@ -1,5 +1,5 @@
 {
-	"translateX": 0,
-	"translateY": 0,
-	"autoRender": false
+  "translateX": 0,
+  "translateY": 0,
+  "autoRender": false
 }