actions dropdown: use material menu icon

css/tt-rss.less

@@ -206,6 +206,17 @@ body.ttrss_main {
 		}
 	}
 
+	.action-chooser {
+		.action-button {
+			.dijitButtonText {
+				vertical-align : unset;
+			}
+			.dijitArrowButtonInner {
+				display : none;
+			}
+		}
+	}
+
 	.hl {
 		border: 0px solid @border-default;
 		border-bottom-width: 1px;