make xml flag consistent

apps/seg/itkimage2segimage.xml

@@ -68,7 +68,7 @@
       <name>referencesGeometryCheck</name>
       <label>Check referenced source image geometry</label>
       <channel>input</channel>
-      <longflag>refGeometryCheck</longflag>
+      <longflag>referencesGeometryCheck</longflag>
       <default>1</default>
       <description>Check whether referenced image slices match the geometry of the segmentation before adding them to the references list. Set this flag to 0 to bypass these checks and add references independently of the geometry consistency.</description>
     </integer>