Address review comments

extensions/ql-vscode/package.json

@@ -183,6 +183,8 @@
         "codeQL.runningQueries.maxPaths": {
           "type": "integer",
           "default": 4,
+          "minimum": 1,
+          "maximum": 256,
           "markdownDescription": "Max number of paths to display for each alert found by a path query (`@kind path-problem`)."
         },
         "codeQL.runningQueries.autoSave": {

extensions/ql-vscode/src/vscode-tests/minimal-workspace/config.test.ts

@@ -48,6 +48,10 @@ describe('config listeners', function() {
         name: 'codeQL.runningTests.numberOfThreads',
         property: 'numberTestThreads',
         values: [1, 0]
+      }, {
+        name: 'codeQL.runningQueries.maxPaths',
+        property: 'maxPaths',
+        values: [0, 1]
       }]
     },
     {