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As can happen when inputting the pairing code wrong.

Closes: #67

Closes: #65

lib/bluetooth-pairing-dialog.c: In function ‘bluetooth_pairing_dialog_set_mode’:
include/glib-2.0/glib/gmacros.h:928:7: warning: ‘help’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  928 |    if (expr)                                    \
      |       ^
lib/bluetooth-pairing-dialog.c:69:8: note: ‘help’ was declared here
   69 |  char *help;
      |        ^~~~

Spotted by Mohammed Sadiq <sadiq@sadiqpk.org>

The alias can be overridden by third-parties and will be used by
bluetoothd to set the externally visible name, so we need to use it
rather than the (usually computationally) set name.

Closes: #50