fix(handlers): fix extfs handler for samples with spaces in their names.

The Command extractor definition for our extfs handler was defined so
that a sample with space in its name would make debugfs go haywire since
the path was not properly quoted.

debugfs -R 'rdump / a_sample_with_no_space.ext4_extract' sample.ext4 -> works

debugfs -R 'rdump / a sample with space.ext4_extract' sample.ext4 -> does not work

Fixed by quoting the output dir :)

unblob/handlers/filesystem/extfs.py

@@ -64,7 +64,7 @@ class EXTHandler(StructHandler):
 
     PATTERN_MATCH_OFFSET = -MAGIC_OFFSET
 
-    EXTRACTOR = Command("debugfs", "-R", "rdump / {outdir}", "{inpath}")
+    EXTRACTOR = Command("debugfs", "-R", 'rdump / "{outdir}"', "{inpath}")
 
     def valid_header(self, header) -> bool:
         if header.s_state not in [0x1, 0x2]: