tdf#120859 bad column span in .ui leads to overlapping checkbuttons

possibly(?) since...

commit d999b55e
Date:   Sun Dec 10 10:56:38 2017 +0530

    tdf#114200  : added 'Trim space' feature in 'Text Import'

    made a checkbox to Trim extra white spaces from both ends
    while using seperators in 'Text Imort'

Change-Id: I280c5daacdc823ea26d02890ddbc4685a5382e6c
Reviewed-on: https://gerrit.libreoffice.org/65427
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/uiconfig/scalc/ui/textimportcsv.ui

 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.20.4 -->
+<!-- Generated with glade 3.22.1 -->
 <interface domain="sc">
   <requires lib="gtk+" version="3.18"/>
   <requires lib="LibreOffice" version="1.0"/>
@@ -311,7 +311,7 @@
                                   <packing>
                                     <property name="left_attach">0</property>
                                     <property name="top_attach">1</property>
-                                    <property name="width">4</property>
+                                    <property name="width">2</property>
                                   </packing>
                                 </child>
                                 <child>
@@ -329,7 +329,7 @@
                                   <packing>
                                     <property name="left_attach">2</property>
                                     <property name="top_attach">1</property>
-                                    <property name="width">4</property>
+                                    <property name="width">2</property>
                                   </packing>
                                 </child>
                                 <child>