dialer: Replace * by ∗

Use the asterisk operator character rather than the asterisk character.
This allows the asterisk to be aligned with the other characters, making
the dialer look better.
1 job for asterisk in 2 minutes and 13 seconds (queued for 5 minutes and 43 seconds)
Status Job ID Name Coverage
  Build
passed #2110
librem5
build-debian

00:02:13