refactor: simplify coastline HTML structure by removing unnecessary line breaks

Author: Azgaar

tests/e2e/layers.spec.ts-snapshots/coastline.html

@@ -1,14 +1 @@
-<g id="coastline"
-  ><g
-    id="sea_island"
-    opacity="0.5"
-    stroke="#1f3846"
-    stroke-width="0.5"
-    filter="url(#dropShadow)"
-    auto-filter="1"
-    style="filter: none"
-    ><use href="#feature_2" data-f="2"></use><use href="#feature_3" data-f="3"></use
-    ><use href="#feature_4" data-f="4"></use><use href="#feature_5" data-f="5"></use
-    ><use href="#feature_6" data-f="6"></use><use href="#feature_15" data-f="15"></use></g
-  ><g id="lake_island" opacity="1" stroke="#7c8eaf" stroke-width="0.35"></g
-></g>
+<g id="coastline"><g id="sea_island" opacity="0.5" stroke="#1f3846" stroke-width="0.5" filter="url(#dropShadow)" auto-filter="1" style="filter: none;"><use href="#feature_2" data-f="2"></use><use href="#feature_3" data-f="3"></use><use href="#feature_4" data-f="4"></use><use href="#feature_5" data-f="5"></use><use href="#feature_6" data-f="6"></use><use href="#feature_15" data-f="15"></use></g><g id="lake_island" opacity="1" stroke="#7c8eaf" stroke-width="0.35"></g></g>