Restore 16px 'Don't show this again' dialog links

These were Chakra <Link as="button">: no size scale, so they inherited
the dialog's 16px document size. The port to Button variant="link"
brought the Button size scale with it (md = 14.4px on this app's
shrunken fontSizes), silently shrinking them. size="lg" (16.2px) is
the nearest scale size; the link variant still zeroes lg's
height/padding. Verified against production: box centres within
0.25px.

ModuleOverlay's inline link is the other Link-conversion but sits in
md Text where inherited and variant sizes coincide — unchanged.

Author: microbit-matt-hillsdon

src/common/GenericDialog.tsx

@@ -76,6 +76,7 @@ export const GenericDialogFooter = ({
       {!dialogNormallyHidden && !shownByRequest && (
         <Button
           variant="link"
+          size="lg"
           onPress={onCloseDontShowAgain}
           css={{ color: "brand.500", mr: "auto" }}
         >

src/workbench/connect-dialogs/ConnectDialog.tsx

@@ -100,6 +100,7 @@ const ConnectDialogFooter = ({
       {!dialogNormallyHidden && !shownByRequest && (
         <Button
           variant="link"
+          size="lg"
           onPress={onNextDontShowAgain}
           css={{ color: "brand.500", mr: "auto" }}
         >