[JENKINS-68801] Fix for Functions#extractPluginNameFromIconSrc (#6902)

Co-authored-by: Temirlan Dyussyumbayev <bzzitsme@users.noreply.github.com>
Co-authored-by: Alexander Brandes <mc.cache@web.de>

core/src/main/java/hudson/Functions.java

@@ -2341,7 +2341,7 @@ public class Functions {
         String[] arr = iconSrc.split(" ");
         for (String element : arr) {
             if (element.startsWith("plugin-")) {
-                return element.replace("plugin-", "");
+                return element.replaceFirst("plugin-", "");
             }
         }