refactor(runtime-dom): remove xlink support since it's been deprecated

packages/runtime-dom/src/modules/attrs.ts

@@ -1,31 +1,7 @@
-const xlinkNS = 'http://www.w3.org/1999/xlink'
+export function patchAttr(el: Element, key: string, value: any) {
-
-function isXlink(name: string): boolean {
-  return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
-}
-
-function getXlinkProp(name: string): string {
-  return isXlink(name) ? name.slice(6, name.length) : ''
-}
-
-export function patchAttr(
-  el: Element,
-  key: string,
-  value: any,
-  isSVG: boolean
-) {
-  // isSVG short-circuits isXlink check
-  if (isSVG && isXlink(key)) {
-    if (value == null) {
-      el.removeAttributeNS(xlinkNS, getXlinkProp(key))
-    } else {
-      el.setAttributeNS(xlinkNS, key, value)
-    }
-  } else {
   if (value == null) {
     el.removeAttribute(key)
   } else {
     el.setAttribute(key, value)
   }
-  }
 }

packages/runtime-dom/src/patchProp.ts

@@ -53,7 +53,7 @@ export function patchProp(
           unmountChildren
         )
       } else {
-        patchAttr(el, key, nextValue, isSVG)
+        patchAttr(el, key, nextValue)
       }
       break
   }