Fix path issue in basic_window

Issue showed up when running y2018 graph_edit, the issue
was with constants not being found. The fix was just changing
the path to be a full path.

Signed-off-by: Maxwell Henderson <mxwhenderson@gmail.com>
Change-Id: If633dd838b0c4c71946d1e623611f8b5f6954c08
diff --git a/frc971/control_loops/python/basic_window.py b/frc971/control_loops/python/basic_window.py
index 44e4f49..886a5d3 100755
--- a/frc971/control_loops/python/basic_window.py
+++ b/frc971/control_loops/python/basic_window.py
@@ -7,7 +7,7 @@
 from gi.repository import Gdk
 from gi.repository import GdkX11
 import cairo
-from constants import *
+from frc971.control_loops.python.constants import *
 
 identity = cairo.Matrix()