fix(merged-issues): Fix ability to select issues in table (#54080)

Fixes https://github.com/getsentry/sentry/issues/54055

Regressed due to https://github.com/getsentry/sentry/pull/53897

Nothing was calling the `handleToggle` function - this adds it back to
the correct place.

static/app/views/issueDetails/groupMerged/mergedItem.tsx

@@ -104,7 +104,7 @@ class MergedItem extends Component<Props, State> {
     return (
       <MergedGroup busy={busy}>
         <Controls expanded={!collapsed}>
-          <FingerprintLabel onClick={this.handleLabelClick}>
+          <FingerprintLabel onClick={this.handleToggle}>
             <Tooltip
               containerDisplayMode="flex"
               disabled={!checkboxDisabled}