Update rofi config

rofi decided to use all default binding /after/ loading the config file, resulting in conflicts…
kb-element-{prev,next} are first unbound then kb-mode-{previous-next} are binded

.config/rofi/config.rasi

@@ -81,6 +81,8 @@ configuration {
 /*	kb-accept-custom-alt: "Control+Shift+Return";*/
 /*	kb-accept-alt: "Shift+Return";*/
 /*	kb-delete-entry: "Shift+Delete";*/
+kb-element-next: "";
+kb-element-prev: "";
 	kb-mode-next: "Tab";
 	kb-mode-previous: "ISO_Left_Tab";
 /*	kb-mode-complete: "Control+l";*/