Make system messages light again

Signed-off-by: Joas Schilling <coding@schilljs.com>

src/components/MessagesList/MessagesGroup/Message/Message.vue

@@ -44,7 +44,7 @@ the main body of the message as well as a quote.
 				<RichText :text="message" :arguments="richParameters" :autolink="true" />
 				<CallButton />
 			</div>
-			<div v-else class="message__main__text">
+			<div v-else class="message__main__text" :class="{'system-message': isSystemMessage}">
 				<Quote v-if="parent" v-bind="quote" />
 				<RichText :text="message" :arguments="richParameters" :autolink="true" />
 			</div>
@@ -207,6 +207,10 @@ export default {
 			return this.isReplyable
 		},
 
+		isSystemMessage() {
+			return this.systemMessage !== ''
+		},
+
 		messageTime() {
 			return OC.Util.formatDate(this.timestamp * 1000, 'LT')
 		},
@@ -347,6 +351,10 @@ export default {
 				text-align: center;
 			}
 
+			&.system-message {
+				color: var(--color-text-maxcontrast);
+			}
+
 			::v-deep .rich-text--wrapper {
 				white-space: pre-wrap;
 				word-break: break-word;