comparators/json: Try fuzzy matching for non-text files too. (Closes: #909122)

Non-text files have even less change being json files, so this fuzzy early
elimination is even more useful for them.  In particular, it avoids loading
large files (like ISO images) just to discover it isn't a JSON format.

Signed-off-by: Chris Lamb <lamby@debian.org>

diffoscope/comparators/json.py

@@ -37,11 +37,7 @@ class JSONFile(File):
     def recognizes(cls, file):
         with open(file.path, 'rb') as f:
             # Try fuzzy matching for JSON files
-            is_text = any(
-                file.magic_file_type.startswith(x)
-                for x in ('ASCII text', 'UTF-8 Unicode text')
-            )
-            if is_text and not file.name.endswith('.json'):
+            if not file.name.endswith('.json'):
                 buf = f.read(10)
                 if not any(x in buf for x in b'{['):
                     return False