Fix icon paths.

core/src/main/resources/com/github/weisj/darklaf/properties/ui/spinner.properties

@@ -47,7 +47,7 @@ Spinner.plus.icon              = misc/plus.svg[themed]
 Spinner.plusInactive.icon      = misc/plus.svg[themed]
 Spinner.minus.icon             = misc/minus.svg[themed]
 Spinner.minusInactive.icon     = misc/minus.svg[themed]
-Spinner.arrowUp.icon           = navigation/arrowUp.svg[themed]
-Spinner.arrowUpInactive.icon   = navigation/arrowUpDisabled.svg[themed]
+Spinner.arrowUp.icon           = navigation/arrow/thick/arrowUp.svg[themed]
+Spinner.arrowUpInactive.icon   = navigation/arrow/thick/arrowUpDisabled.svg[themed]
 Spinner.arrowDown.icon         = navigation/arrow/thick/arrowDown.svg[themed]
-Spinner.arrowDownInactive.icon = navigation/arrowDownDisabled.svg[themed]
+Spinner.arrowDownInactive.icon = navigation/arrow/thick/arrowDownDisabled.svg[themed]