fix missing operator in video encoding test

Tools/Policies/sample_policy_4_mkv_ffv1_digitization.xml

@@ -3,7 +3,7 @@
   <rule name="Is it Matroska?" value="Format" tracktype="General" operator="=">Matroska</rule>
   <rule name="Matroska version 4 or greater?" value="Format_Version" tracktype="General" operator="&gt;=">4</rule>
   <rule name="Unique ID is present?" value="UniqueID" tracktype="General"/>
-  <rule name="Is the video FFV1?" value="Format" tracktype="Video">FFV1</rule>
+  <rule name="Is the video FFV1?" value="Format" tracktype="Video" operator="=">FFV1</rule>
   <rule name="FFV1 is version 3.4 or later?" value="Format_Version" tracktype="Video" operator="&gt;=">3.4</rule>
   <rule name="FFV1 is encoded in GOP size of 1?" value="Format_Settings_GOP" tracktype="Video" operator="=">N=1</rule>
   <rule name="FFV1 uses slice crcs?" value="extra/ErrorDetectionType" tracktype="Video" operator="=">Per slice</rule>