update visualize.py to import rastermap properly

Author: chriski777

suite2p/gui/visualize.py

@@ -10,7 +10,7 @@
 from PyQt5.QtWidgets import QStyle
 from PyQt5.QtWidgets import QWidget, QSlider, QMainWindow, QGridLayout, QStyleOptionSlider, QApplication, QLabel, QLineEdit, QPushButton, QComboBox, QCheckBox
 from matplotlib import cm
-from rastermap.mapping import Rastermap
+from rastermap.rastermap import Rastermap
 from scipy.ndimage import gaussian_filter1d
 from scipy.stats import zscore