chore: delete xmlns prop from svg close icon (#429)

Co-authored-by: pradel <pradel.leo@gmail.com>

Author: RahulArt420

react-responsive-modal/__tests__/__snapshots__/index.test.tsx.snap

@@ -10,7 +10,6 @@ exports[`modal closeIcon should render the closeIcon by default 1`] = `
     height="28"
     viewBox="0 0 36 36"
     width="28"
-    xmlns="http://www.w3.org/2000/svg"
   >
     <path
       d="M28.5 9.62L26.38 7.5 18 15.88 9.62 7.5 7.5 9.62 15.88 18 7.5 26.38l2.12 2.12L18 20.12l8.38 8.38 2.12-2.12L20.12 18z"

react-responsive-modal/src/CloseIcon.tsx

@@ -39,7 +39,6 @@ const CloseIcon = ({
       <svg
         className={classNames?.closeIcon}
         style={styles?.closeIcon}
-        xmlns="http://www.w3.org/2000/svg"
         width={28}
         height={28}
         viewBox="0 0 36 36"