fix(draw): replace aria-pressed with role=tab and aria-selected on signature type tabs

NcButton elements inside role="tablist" were using aria-pressed which
causes screen readers to announce them as toggle buttons instead of tabs.
Screen readers rely on role="tab" + aria-selected to announce tab position
(e.g. "Draw, tab 1 of 3") and to enable arrow-key navigation between tabs.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/components/Draw/Draw.vue

@@ -12,10 +12,11 @@
 			<NcButton
 				v-for="tab in availableTabs"
 				:key="tab.id"
+				role="tab"
 				class="draw-signature__tab"
 				:class="{ 'draw-signature__tab--active': activeTab === tab.id }"
 				variant="tertiary"
-				:aria-pressed="activeTab === tab.id"
+				:aria-selected="activeTab === tab.id"
 				@click="activeTab = tab.id">
 				<NcIconSvgWrapper :path="tab.icon" :size="18" />
 				<span class="draw-signature__tab-label">{{ tab.label }}</span>