Improve accent color modulate visibility for the Anchor editor icon

This switches to the default icon color so that the accent color
modulation becomes more easily visible.

(cherry picked from commit f0c7d78ebfb182777865012fc97f7eb4386583da)

editor/icons/icon_anchor.svg

@@ -1 +1 @@
-<svg height="16" viewBox="0 0 16 16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m8 1a3 3 0 0 0 -3 3 3 3 0 0 0 2 2.8262v.17383h-2v2h2v3.8984a5 5 0 0 1 -3.8281-3.6035l-1.9336.51758a7 7 0 0 0 6.7617 5.1875 7 7 0 0 0 6.7617-5.1875l-1.9375-.51953a5 5 0 0 1 -3.8242 3.6035v-3.8965h2v-2h-2v-.17578a3 3 0 0 0 2-2.8242 3 3 0 0 0 -3-3zm0 2a1 1 0 0 1 1 1 1 1 0 0 1 -1 1 1 1 0 0 1 -1-1 1 1 0 0 1 1-1z" fill="#a5efac"/></svg>
+<svg height="16" viewBox="0 0 16 16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m8 1a3 3 0 0 0 -3 3 3 3 0 0 0 2 2.8262v.17383h-2v2h2v3.8984a5 5 0 0 1 -3.8281-3.6035l-1.9336.51758a7 7 0 0 0 6.7617 5.1875 7 7 0 0 0 6.7617-5.1875l-1.9375-.51953a5 5 0 0 1 -3.8242 3.6035v-3.8965h2v-2h-2v-.17578a3 3 0 0 0 2-2.8242 3 3 0 0 0 -3-3zm0 2a1 1 0 0 1 1 1 1 1 0 0 1 -1 1 1 1 0 0 1 -1-1 1 1 0 0 1 1-1z" fill="#e0e0e0"/></svg>