support/testing: package: gpsd: fix gpsfake command line

The gpsfake command line has a typo (a missing space), which makes the
next gpsctl command to always fail.

This commit fixes the issue by adding the missing space.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/7391792948

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/test_gpsd.py

@@ -33,7 +33,7 @@ class TestGpsd(infra.basetest.BRTest):
         # We start the "gpsfake" GPS emulator instead.
         cmd = "gpsfake"
         cmd += " --slow --cycle 0.1 --quiet"
-        cmd += "/root/udp-nmea.log &> /dev/null &"
+        cmd += " /root/udp-nmea.log &> /dev/null &"
         self.assertRunOk(cmd)
 
         # Wait a bit, to let the gpsfake and gpsd to settle...