Be consistent about casing in Query History

Reported here: github/code-scanning#6008

We originally started out by capitalizing each word [1], but made some
small changes [2] which resulted in our Query History options
being inconsistent.

Let's fix that.

[1]: https://github.com/github/vscode-codeql/blame/a5da5564969a0f37f95f1fe8b856f60810fc5caa/extensions/ql-vscode/package.json
[1]: b470e41

Author: elenatanasoiu

extensions/ql-vscode/package.json

@@ -471,7 +471,7 @@
       },
       {
         "command": "codeQLQueryHistory.openQuery",
-        "title": "Open the query that produced these results",
+        "title": "Open the Query that Produced these Results",
         "icon": {
           "light": "media/light/edit.svg",
           "dark": "media/dark/edit.svg"
@@ -523,7 +523,7 @@
       },
       {
         "command": "codeQLQueryHistory.openQueryDirectory",
-        "title": "Open query directory"
+        "title": "Open Query Directory"
       },
       {
         "command": "codeQLQueryHistory.showEvalLog",