fix: Minimize the default svg icon for marker

Co-authored-by: Yohan Boniface <yohanboniface@free.fr>

umap/static/umap/img/marker.svg

@@ -1,6 +1,3 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg version="1.1" id="circle" width="15" height="15" viewBox="0 0 15 15" sodipodi:docname="marker.svg" inkscape:version="1.4.1 (93de688d07, 2025-03-30)" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg">
-  <defs id="defs1" />
-  <sodipodi:namedview id="namedview1" pagecolor="#ffffff" bordercolor="#666666" borderopacity="1.0" inkscape:showpageshadow="2" inkscape:pageopacity="0.0" inkscape:pagecheckerboard="0" inkscape:deskcolor="#d1d1d1" inkscape:zoom="23.966903" inkscape:cx="7.8232888" inkscape:cy="5.9665616" inkscape:window-width="1920" inkscape:window-height="1011" inkscape:window-x="0" inkscape:window-y="0" inkscape:window-maximized="1" inkscape:current-layer="circle" />
-  <path d="M14,7.5c0,3.5899-2.9101,6.5-6.5,6.5S1,11.0899,1,7.5S3.9101,1,7.5,1S14,3.9101,14,7.5z" id="path1" style="fill:#ffffff;stroke:#3e4444;stroke-opacity:1;stroke-width:0.5;stroke-dasharray:none" />
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 15 15">
+  <path d="M14 7.5a6.5 6.5 0 1 1-13 0 6.5 6.5 0 0 1 13 0z" fill="#fff" stroke="#3e4444" stroke-width=".5"/>
 </svg>