message: Tweak CSP of Snippet Panel.
diff: <head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  - <meta http-equiv="Content-Security-Policy" content="default-src %VSCODE_CSP%; base-uri 'none'; script-src %VSCODE_CSP% 'unsafe-inline'; style-src %VSCODE_CSP% 'unsafe-inline';">
  + <meta http-equiv="Content-Security-Policy" content="default-src 'none'; base-uri 'none'; connect-src %VSCODE_CSP%; script-src %VSCODE_CSP% 'unsafe-inline'; style-src %VSCODE_CSP% 'unsafe-inline';">
  <link rel="stylesheet" href="%VSCODE_RES%/snippetpanel/snippetpanel.css">
  </head>
  <body>
  