files_treeview: Fix image import

Author: ferdnyc

src/windows/views/files_treeview.py

@@ -209,7 +209,7 @@ def get_image_sequence_details(self, file_path):
         """Inspect a file path and determine if this is an image sequence"""
 
         # Get just the file name
-        fileName = os.path.basename(file_path)
+        (dirName, fileName) = os.path.split(file_path)
         extensions = ["png", "jpg", "jpeg", "gif", "tif", "svg"]
         match = re.findall(r"(.*[^\d])?(0*)(\d+)\.(%s)" % "|".join(extensions), fileName, re.I)