fix std option def'ns

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@56394 15284696-431f-4ddb-bdfa-cd5b030d7da7

visualization/wximgview/main.cpp

@@ -256,10 +256,11 @@ int main(int argc, char **argv)
     G_add_keyword(_("visualization"));
     module->description = _("View BMP images from the PNG driver.");
 
-    opt.image = G_define_standard_option(G_OPT_F_OUTPUT);
+    opt.image = G_define_standard_option(G_OPT_F_INPUT);
     opt.image->key = "image";
     opt.image->required = YES;
-    opt.image->description = _("Name for output image file");
+    opt.image->gisprompt = "old_file,file,file";
+    opt.image->description = _("Image file");
 
     opt.percent = G_define_option();
     opt.percent->key = "percent";

visualization/ximgview/main.c

@@ -294,10 +294,11 @@ int main(int argc, char **argv)
     G_add_keyword(_("visualization"));
     module->description = _("View BMP images from the PNG driver.");
 
-    opt.image = G_define_standard_option(G_OPT_F_OUTPUT);
+    opt.image = G_define_standard_option(G_OPT_F_INPUT);
     opt.image->key = "image";
     opt.image->required = YES;
-    opt.image->description = _("Name for output image file");
+    opt.image->gisprompt = "old_file,file,file";
+    opt.image->description = _("Image file");
 
     opt.percent = G_define_option();
     opt.percent->key = "percent";