Adujst search_more option to accept True or true values.

web_m2x_options/static/src/js/form.js

@@ -63,8 +63,10 @@ openerp.web_m2x_options = function (instance) {
             }
 
             // add options search_more to force enable or disable search_more button
-            if(typeof this.options.search_more === 'boolean') {
-                this.search_more = this.options.search_more
+            var search_more_defined = !_.isUndefined(this.options.search_more)
+            if((search_more_defined && this.options.search_more.toLowerCase() === "true") ||
+               !(search_more_defined && this.options.search_more.toLowerCase() === "false") && (self.view.ir_options['web_m2x_options.search_more'] === "True")) {
+                this.search_more = true
             }
 
             // add options field_color and colors to color item(s) depending on field_color value