Forgot a fixture for param_light_params. Travis CI needs to not get l…

…azy about telling me this.

tests/lights/fixtures/test_unused_param_pass.obj

@@ -0,0 +1,17 @@
+I
+800
+OBJ
+
+POINT_COUNTS	0	0	0	0
+
+# 0 ROOT
+	# 1 Empty: unused_param_pass
+	# EMPTY: unused_param_pass	weight: 0
+		# 2 Light: 08_flood_merc_XYZTSB
+		# LIGHT: 08_flood_merc_XYZTSB	weight: 10000
+		LIGHT_PARAM	flood_merc_XYZTSB 0 0 -0 1 2 3    4   5.123  6
+		# 2 Light: 10_sodium_flood_XYZBTSS
+		# LIGHT: 10_sodium_flood_XYZBTSS	weight: 10000
+		LIGHT_PARAM	sodium_flood_XYZBTSS 0 0 -0 1 2 3    4   5  6    7.123
+
+# Build with Blender 2.80 (sub 75) (build b'f6cb5f54494e'). Exported with XPlane2Blender 4.0.0-dev.0+80.NO_BUILD_NUMBR