add calibration to fake reader channels

Add calibration to the fake reader channels matching 0.86 and 0.91, so
that the workaround added in 6a7a78a
does not change the total number of expected datasets in test_load.py

satpy/tests/etc/readers/fake1.yaml

@@ -60,6 +60,7 @@ datasets:
   ds8:
     name: ds8
     wavelength: [0.7, 0.8, 0.9]
+    calibration: "reflectance"
     file_type: fake_file1
     coordinates: [lons, lats]
   ds9_fail_load:
@@ -70,6 +71,7 @@ datasets:
   ds10:
     name: ds10
     wavelength: [0.75, 0.85, 0.95]
+    calibration: "reflectance"
     file_type: fake_file1
     coordinates: [lons, lats]
   ds11: