Remove stroke from CSS rules that colorize plugin icons (#13719)

* Remove stroke from CSS rules that colorize plugin icons

* Restored stroke values and added stroke-width property

packages/edit-post/src/components/header/pinned-plugins/style.scss

@@ -14,18 +14,21 @@
 	.components-icon-button:not(.is-toggled) svg * {
 		stroke: $dark-gray-500;
 		fill: $dark-gray-500;
+		stroke-width: 0; // !important is omitted here, so stroke-only icons can override easily.
 	}
 
 	// Forcefully colorize hover and toggled plugin icon states to ensure legibility and consistency.
 	.components-icon-button.is-toggled svg,
 	.components-icon-button.is-toggled svg * {
 		stroke: $white !important;
 		fill: $white !important;
+		stroke-width: 0; // !important is omitted here, so stroke-only icons can override easily.
 	}
 
 	.components-icon-button:hover svg,
 	.components-icon-button:hover svg * {
 		stroke: $dark-gray-900 !important;
 		fill: $dark-gray-900 !important;
+		stroke-width: 0; // !important is omitted here, so stroke-only icons can override easily.
 	}
 }