fix(module:typography): add type="button" attribute to button element…

… in nz-text-copy component (#6606)

add button attribute to prevent form submission on some browsers when copying to clipboard

closes #6605

Co-authored-by: Sam Goldmann <samuel.goldmann@ancorasoftware.com>

components/typography/text-copy.component.ts

@@ -29,6 +29,7 @@ import { takeUntil } from 'rxjs/operators';
   exportAs: 'nzTextCopy',
   template: `
     <button
+      type="button"
       nz-tooltip
       nz-trans-button
       [nzTooltipTitle]="copied ? copedTooltip : copyTooltip"