Fix embedded contacts and contact detail in dark theme

stylesheets/_modules.scss

@@ -1114,13 +1114,13 @@
 
 .module-contact-detail__additional-contact {
   text-align: left;
-  border-top: 1px solid $grey_l1_5;
+  border-top: 1px solid $color-light-10;
   margin-top: 15px;
   padding-top: 8px;
 }
 
 .module-contact-detail__additional-contact__type {
-  color: rgba(0, 0, 0, 0.5);
+  color: $color-light-45;
   font-size: 12px;
   margin-bottom: 3px;
 }

stylesheets/_theme_dark.scss

@@ -747,8 +747,8 @@ body.dark-theme {
 
   .module-message__send-message-button {
     color: $color-signal-blue;
-    background-color: $color-light-02;
-    border: 1px solid $color-black-012;
+    background-color: $color-dark-70;
+    border: 1px solid $color-dark-60;
   }
 
   .module-message__author-default-avatar--grey {
@@ -1012,8 +1012,12 @@ body.dark-theme {
     @include color-svg('../images/chat-bubble.svg', white);
   }
 
+  .module-contact-detail__additional-contact {
+    border-top: 1px solid $color-dark-70;
+  }
+
   .module-contact-detail__additional-contact__type {
-    color: rgba(0, 0, 0, 0.5);
+    color: $color-light-45;
   }
 
   // Module: Group Notification