Update trace.py - parenthesis fix

so "rb" argument is used by open() rather than pickle.load()

snub/gui/tracks/trace.py

@@ -78,7 +78,7 @@ def __init__(
         if data is not None:
             self.data = data
         else:
-            self.data = pickle.load(open(data_path), "rb")
+            self.data = pickle.load(open(data_path, "rb"))
 
         if initial_visible_traces is not None:
             self.visible_traces = set(initial_visible_traces)