CSS: Set modal header color for error alerts

Also fix various element colors for Dracula theme

src/plugins/controlbox/styles/_controlbox.scss

@@ -401,7 +401,7 @@
             .toggle-controlbox {
                 order: -2;
                 text-align: center;
-                background-color: var(--link-color);
+                background-color: var(--controlbox-head-color);
                 border-top-left-radius: var(--button-border-radius);
                 border-top-right-radius: var(--button-border-radius);
                 color: #0a0a0a;

src/plugins/minimize/styles/minimize.scss

@@ -71,6 +71,9 @@
                     }
                     .chat-head-chatroom {
                         background-color: var(--chatroom-head-bg-color);
+                        a.restore-chat {
+                            color: var(--chatroom-head-color);
+                        }
                     }
                     &.minimized {
                         height: auto;

src/plugins/modal/styles/_modal.scss

@@ -5,6 +5,18 @@
 .conversejs {
     @import "bootstrap/scss/modal";
 
+    .modal-header {
+        &.alert-danger {
+            background-color: var(--error-color);
+            color: var(--background);
+            border-bottom: none;
+
+            .close {
+                color: var(--background);
+            }
+        }
+    }
+
     .modal-content {
         background-color: var(--modal-background-color);
     }

src/plugins/muc-views/styles/muc-head.scss

@@ -37,7 +37,7 @@
             a, a:visited, a:hover, a:not([href]):not([tabindex]) {
                 &.chatbox-btn {
                     &.fa {
-                        color: var(--chat-head-text-color);
+                        color: var(--chatroom-head-color);
                         &.button-on:before {
                             color: var(--chatroom-head-button-color);
                         }