Fix fontforge script command

  * debian/rules: Fix fontforge script command
8 jobs for master in 8 minutes and 51 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #412465
build

00:04:43

 
  Test
passed #412470
autopkgtest

00:03:16

passed #412471
blhc

00:01:33

passed #412469
allowed to fail
lintian

00:01:54

passed #412472
piuparts

00:03:13

passed #412468
reprotest

00:03:13

passed #412467
test-build-all

00:04:08

passed #412466
test-build-any

00:02:22