fix(icons): arcified cake-slice icon (#3345)

* Updated icons/cake-slice.svg

* Updated icons/cake-slice.json

icons/cake-slice.json

@@ -1,7 +1,8 @@
 {
   "$schema": "../icon.schema.json",
   "contributors": [
-    "danielbayley"
+    "danielbayley",
+    "jguddas"
   ],
   "tags": [
     "birthday",

icons/cake-slice.svg

@@ -9,8 +9,8 @@
   stroke-linecap="round"
   stroke-linejoin="round"
 >
-  <circle cx="9" cy="7" r="2" />
-  <path d="M7.2 7.9 3 11v9c0 .6.4 1 1 1h16c.6 0 1-.4 1-1v-9c0-2-3-6-7-8l-3.6 2.6" />
   <path d="M16 13H3" />
   <path d="M16 17H3" />
+  <path d="m7.2 7.9-3.388 2.5A2 2 0 0 0 3 12.01V20a1 1 0 0 0 1 1h16a1 1 0 0 0 1-1v-8.654c0-2-2.44-6.026-6.44-8.026a1 1 0 0 0-1.082.057L10.4 5.6" />
+  <circle cx="9" cy="7" r="2" />
 </svg>