Print correctly the first filename

It was not splitting the extension

src/bin/expedite-cmp

@@ -70,8 +70,9 @@ def report_text():
     fmtsize = len(options.format % {"value": 12345.67, "percentual": 1234.56})
     hdrfmt = "%%%d.%ds" % (fmtsize, fmtsize)
 
-    print(test_name_fmt % "\\", end=' ')
-    print("%7.7s" % (files[0][-7:],), end=' ')
+    print(test_name_fmt % "Files", end=' ')
+    first_filename, _ = os.path.splitext(files[0])
+    print("%7.7s" % (first_filename[-7:],), end=' ')
     for f in files[1:]:
         n, e = os.path.splitext(f)
         print(hdrfmt % n[-fmtsize:], end=' ')