fix: tweak how grid filter params are built, for better link share

src/wuttaweb/templates/grids/vue_template.mako

@@ -653,9 +653,21 @@
                           params[filter.key+'.verb'] = filter.verb
                       }
                   }
-                  if (Object.keys(params).length) {
+
+                  ## nb. we used to add filter=true only if some
+                  ## filter(s) is currently active, but that can cause
+                  ## problems when sharing a link for a grid which
+                  ## *currently* has no active filters, but which does
+                  ## have *default* filters.  so for now we always
+                  ## declare filters to be "in effect" even if there
+                  ## are none active.  hopefully that does not break
+                  ## anything else but this note is here just in case.
+
+                  ## if (Object.keys(params).length) {
+                  ##     params.filter = 'true'
+                  ## }
                   params.filter = 'true'
-                  }
+
                   return params
               },