Add ISE theme settings borders (#2935)

Author: CalistusK

themes/theme-psise/theme.json

@@ -198,6 +198,10 @@
         "activityBarBadge.background": "#A9A9A9",
         "editor.lineHighlightBackground": "#add8e6",
         "editor.selectionBackground": "#94c6f7",
+        "settings.checkboxBorder": "#A9A9A9",
+        "settings.dropdownBorder": "#A9A9A9",
+        "settings.numberInputBorder": "#A9A9A9",
+        "settings.textInputBorder": "#A9A9A9",
         "statusBar.background": "#999999",
         "statusBar.debuggingBackground": "#FF4500",
         "statusBar.noFolderBackground": "#999999",