[test] remove init from test folder, fix? plt backend issue

nixview/ui/plotscreen.py

@@ -2,7 +2,11 @@ from nixview.util.enums import PlotterTypes
 from PyQt5.QtWidgets import QGroupBox, QHBoxLayout, QLabel, QPushButton, QSizePolicy, QSlider, QVBoxLayout, QWidget
 from PyQt5.QtCore import pyqtSignal, Qt
 import matplotlib
+try:
     matplotlib.use('Qt5Agg')
+except:
+    matplotlib.use("Agg")
+    print("Cannot load Qt5Agg backend")
 from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas, NavigationToolbar2QT as NavigationToolbar
 from matplotlib.figure import Figure
 import nixio as nix