fix(NcAvatar): Increase contrast of avatar status icon

Signed-off-by: Christopher Ng <chrng8@gmail.com>

Author: Pytal

src/components/NcAvatar/NcAvatar.vue

@@ -837,6 +837,7 @@ export default {
 		line-height: 15px;
 		font-size: var(--default-font-size);
 		border: 2px solid var(--color-main-background);
+		outline: var(--color-main-text) solid 2px;
 		background-color: var(--color-main-background);
 		background-repeat: no-repeat;
 		background-size: 16px;