Changed spline and scale-3d start and end to be circular (#1137)

* Changed `spline` start and end to be circular

* Update scale-3d.svg

icons/scale-3d.svg

@@ -9,8 +9,8 @@
   stroke-linecap="round"
   stroke-linejoin="round"
 >
+  <circle cx="19" cy="19" r="2" />
+  <circle cx="5" cy="5" r="2" />
   <path d="M5 7v12h12" />
   <path d="m5 19 6-6" />
-  <rect width="4" height="4" x="3" y="3" rx="1" />
-  <rect width="4" height="4" x="17" y="17" rx="1" />
 </svg>

icons/spline.svg

@@ -9,7 +9,7 @@
   stroke-linecap="round"
   stroke-linejoin="round"
 >
-  <path d="M21 6V4c0-.6-.4-1-1-1h-2a1 1 0 0 0-1 1v2c0 .6.4 1 1 1h2c.6 0 1-.4 1-1Z" />
-  <path d="M7 20v-2c0-.6-.4-1-1-1H4a1 1 0 0 0-1 1v2c0 .6.4 1 1 1h2c.6 0 1-.4 1-1Z" />
+  <circle cx="19" cy="5" r="2" />
+  <circle cx="5" cy="19" r="2" />
   <path d="M5 17A12 12 0 0 1 17 5" />
 </svg>