fix(ui5-tabcontainer): fix overflow item default semantic color (#989)

This is a follow up of Follow up of: #988 where overflow items appearance in negative, positive and critical states have been fixed. However, I missed the default semantic appearance.
Now the default semantic appearance of the overflow item text and icon in active state also looks correct.

Author: ilhan007

packages/main/src/themes/TabContainer.css

@@ -233,15 +233,10 @@
 }
 
 .ui5-tc__overflowItem ui5-icon {
-	color: var(--sapUiNeutralText);
-}
-
-.ui5-tc__overflowItem--positive ui5-icon, 
-.ui5-tc__overflowItem--negative ui5-icon,
-.ui5-tc__overflowItem--critical ui5-icon {
 	color: currentColor;
 }
 
+
 .ui5-tc__content {
 	background-color: var(--sapUiGroupContentBackground);
 	border-bottom: var(--_ui5_tc_content_border_bottom);

packages/main/test/pages/TabContainer.html

@@ -83,9 +83,13 @@ <h4>Filter</h4>
 					</ui5-tab>
 					<ui5-tab icon="sap-icon://menu" text="Monitors" selected semantic-color="Critical" additional-text="45">
 					</ui5-tab>
-				<ui5-tab icon="sap-icon://menu2" text="Keyboards"  semantic-color="Negative" additional-text="15">
-				</ui5-tab>
-				<ui5-tab icon="sap-icon://menu2" disabled="true" text="Disabled"  semantic-color="Negative" additional-text="40">
+					<ui5-tab icon="sap-icon://menu2" text="Keyboards"  semantic-color="Negative" additional-text="15">
+					</ui5-tab>
+					<ui5-tab icon="sap-icon://menu2" disabled="true" text="Disabled"  semantic-color="Negative" additional-text="40">
+					</ui5-tab>
+					<ui5-tab icon="sap-icon://menu2" text="Neutral" semantic-color="Neutral" additional-text="40">
+					</ui5-tab>
+					<ui5-tab icon="sap-icon://menu2" text="Default" additional-text="40">
 					</ui5-tab>
 				</ui5-tabcontainer>
 			</div>