Add basic rescan options to import popup

src/privkey.ui

@@ -21,27 +21,34 @@
      </property>
     </widget>
    </item>
-   <item>
+   <item row="2" column="0">
     <widget class="QCheckBox" name="chkrescan">
      <property name="text">
       <string>Rescan</string>
      </property>
      <property name="checkable">
-      <bool>false</bool>
+      <bool>true</bool>
      </property>
      <property name="checked">
-      <bool>false</bool>
+      <bool>true</bool>
      </property> 
     </widget>
    </item>
-   <item>
+   <item row="2" column="1">
+    <widget class="QLabel" name="rescanlabel">
+     <property name="text">
+      <string>Rescan Height</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="2">
     <widget class="QLineEdit" name="rescanfrom">
      <property name="text">
-      <string notr="true">1600000</string>
+      <string notr="true">1</string>
      </property>
     </widget>
    </item>
-   <item row="2" column="0">
+   <item row="3" column="0">
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
       <enum>Qt::Horizontal</enum>