fix(kit): TasbWithMore fix redundant left margin for single element (…

…#7022)

(cherry picked from commit 9245d8b)

projects/kit/components/tabs/tab/tab.style.less

@@ -6,11 +6,16 @@
 
 :host-context(tui-tabs >):first-child,
 :host-context([tuiTabs] >):first-child,
-:host-context(tui-tabs > :first-child),
-:host-context([tuiTabs] > :first-child) {
+:host-context(tui-tabs > :not(.t-overflown) >):first-child,
+:host-context([tuiTabs] > :not(.t-overflown) >):first-child {
     margin-left: 0;
 }
 
+:host-context([tuiTabs] > [tuiTab] ~ :not(.t-overflown) >):first-child,
+:host-context(tui-tabs > [tuiTab] ~ :not(.t-overflown) >):first-child {
+    margin-left: var(--tui-tab-margin, 1.5rem);
+}
+
 :host {
     .transition(~'color, box-shadow, opacity, background');
     .clearbtn();