astrodatagui: disable plot options by default

enable then when the first section/target table id was selected

main/astrodatagui/AstrodataGUI.py

@@ -160,6 +160,7 @@ class AstrodataGUI(QtWidgets.QMainWindow):
         self.updateStarAltNames(altNames)
 
     def sequenceSelected(self, item):
+        self.gbPlotOptions.setEnabled(True)
         seqText = item.text().split(" - ")
         mainName = self.listDownloaded.currentItem().text()
         source = seqText[0]

main/astrodatagui/astrodatagui.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>1612</width>
+    <width>1658</width>
     <height>1043</height>
    </rect>
   </property>
@@ -218,7 +218,10 @@
              </widget>
             </item>
             <item row="0" column="2">
-             <widget class="QGroupBox" name="groupBox_4">
+             <widget class="QGroupBox" name="gbPlotOptions">
+              <property name="enabled">
+               <bool>false</bool>
+              </property>
               <property name="sizePolicy">
                <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
                 <horstretch>0</horstretch>
@@ -1004,7 +1007,7 @@
     <rect>
      <x>0</x>
      <y>0</y>
-     <width>1612</width>
+     <width>1658</width>
      <height>21</height>
     </rect>
    </property>