Adjust style of NcSelect to match other input elements

* Border should be primary color on hover
* Border should be stay primary color if active
* Unify the style of the `no-options` slot with `NcMultiselect`

Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>

src/components/NcSelect/NcSelect.vue

@@ -983,7 +983,20 @@ export default {
 	}
 }
 
+.v-select {
+	&:not(.vs--open) .vs__dropdown-toggle:hover {
+		border-color: var(--color-primary);
+	}
+
+	&.vs--open .vs__dropdown-toggle {
+		border-color: var(--color-primary);
+		border-bottom-color: transparent;
+	}
+}
+
 .vs__dropdown-menu {
+	border-color: var(--color-primary);
+
 	&--floating {
 		width: max-content;
 		position: absolute;
@@ -997,5 +1010,9 @@ export default {
 			box-shadow: 0px -1px 1px 0px var(--color-box-shadow);
 		}
 	}
+
+	.vs__no-options {
+		color: var(--color-text-lighter)
+	}
 }
 </style>