Fix changelog link colour back to blue

https://github.com/matrix-org/matrix-react-sdk/pull/5698 changed all dialog
links to green, which is not expected. In general, we use blue links for
information and green links for actions.

This resolves the regression by removing the general change and adjusting the
new links added by the above PR to be green as desired there.

Fixes https://github.com/vector-im/element-web/issues/18726

res/css/_common.scss

@@ -381,11 +381,6 @@ input[type=text]:focus, input[type=password]:focus, textarea:focus {
     font-size: $font-14px;
     color: $primary-content;
     word-wrap: break-word;
-
-    a {
-        color: $accent-color;
-        cursor: pointer;
-    }
 }
 
 .mx_Dialog_buttons {

src/components/views/settings/tabs/room/SecurityRoomSettingsTab.tsx

@@ -149,10 +149,12 @@ export default class SecurityRoomSettingsTab extends React.Component<IProps, ISt
                         "To avoid these issues, create a <a>new encrypted room</a> for " +
                         "the conversation you plan to have.",
                         null,
-                        { "a": (sub) => <a onClick={() => {
-                            dialog.close();
-                            this.createNewRoom(false, true);
-                        }}> { sub } </a> },
+                        { "a": (sub) => <a
+                            className="mx_linkButton"
+                            onClick={() => {
+                                dialog.close();
+                                this.createNewRoom(false, true);
+                            }}> { sub } </a> },
                     ) } </p>
                 </div>,
 
@@ -248,10 +250,12 @@ export default class SecurityRoomSettingsTab extends React.Component<IProps, ISt
                         "you plan to have.",
                         null,
                         {
-                            "a": (sub) => <a onClick={() => {
-                                dialog.close();
-                                this.createNewRoom(true, false);
-                            }}> { sub } </a>,
+                            "a": (sub) => <a
+                                className="mx_linkButton"
+                                onClick={() => {
+                                    dialog.close();
+                                    this.createNewRoom(true, false);
+                                }}> { sub } </a>,
                         },
                     ) } </p>
                 </div>,