cleanup and typo

mainwin.py

@@ -57,7 +57,7 @@ class MainWindow(QMainWindow):
                 sub.plot.setData(pd.xs, pd.ys)
 
         if show_it:
-            ps = lst.data[name]
+            pd = lst.data[name]
             self.sig_make_new_plot.emit(name, pd)
 
 

mdi.py

@@ -4,7 +4,7 @@ from PyQt5.QtGui import QPainter
 import pyqtgraph as pg
 
 import assets
-from theme import MDI_BKG, pg_plot_style
+from theme import MDI_BKG
 
 
 class MDIArea(QMdiArea):

plotdesc.py

@@ -1,4 +1,3 @@
-import pyqtgraph as pg
 from theme import pg_plot_style