change back conversion widget to QLineEdit because conversion can go down to...

change back conversion widget to QLineEdit because conversion can go down to 1.0e-06, the range of value are large

sohstationviewer/view/db_config/add_edit_single_channel_dialog.py

@@ -72,14 +72,14 @@ class AddEditSingleChannelDialog(QDialog):
             "added to channel name to be displayed")
 
         # convert factor to change from count to actual value
-        self.convesion_lnedit = QtWidgets.QLineEdit(self)
-        self.convesion_lnedit.setPlaceholderText(
+        self.conversion_lnedit = QtWidgets.QLineEdit(self)
+        self.conversion_lnedit.setPlaceholderText(
             "to convert from count to actual value"
         )
         validator = QtGui.QDoubleValidator(0.0, 5.0, 6)
         validator.setNotation(QtGui.QDoubleValidator.StandardNotation)
-        self.convesion_lnedit.setValidator(validator)
-        self.convesion_lnedit.setText('1')
+        self.conversion_lnedit.setValidator(validator)
+        self.conversion_lnedit.setText('1')
 
         # channel's unit
         self.unit_lnedit = QtWidgets.QLineEdit(self)
@@ -224,7 +224,7 @@ class AddEditSingleChannelDialog(QDialog):
 
         self.label_lnedit.setText(self.channel_info['label'])
 
-        self.convesion_lnedit.setText(
+        self.conversion_lnedit.setText(
             str(float(self.channel_info['convertFactor'])))
 
         self.unit_lnedit.setText(self.channel_info['unit'])