Launch widget dropdown gets white background in Windows

fixes #16706

src/vs/workbench/parts/debug/browser/media/debugViewlet.css

@@ -76,12 +76,17 @@
 }
 
 .monaco-workbench .monaco-action-bar .start-debug-action-item .configuration .select-box {
-	background-color: inherit;
+	background-color: #f3f3f3;
 	border: none;
 	margin-top: 0px;
 	cursor: pointer;
 }
 
+.vs-dark .monaco-workbench .monaco-action-bar .start-debug-action-item .configuration .select-box,
+.hc-black .monaco-workbench .monaco-action-bar .start-debug-action-item .configuration .select-box {
+	background-color: #252526;
+}
+
 .monaco-workbench .monaco-action-bar .start-debug-action-item .configuration.disabled .select-box {
 	opacity: 0.7;
 	font-style: italic;