fix allowing to update namespaced pm2 NPM module (@org/module-name)

[endel]

This PR fixes the issue when trying to run pm2 install @colyseus/tools the second time:

Error:

Error: ENOENT: no such file or directory, mkdir '/tmp/@colyseus/tools'
    at Object.mkdirSync (node:fs:1371:26)
    at copydirSync (/usr/lib/node_modules/pm2/lib/tools/copydirSync.js:38:14)
    at Object.backup (/usr/lib/node_modules/pm2/lib/API/Modules/NPM.js:438:5)
    at /usr/lib/node_modules/pm2/lib/API/Modules/NPM.js:170:16
    at moduleExistInLocalDB (/usr/lib/node_modules/pm2/lib/API/Modules/NPM.js:162:10)
    at Object.install (/usr/lib/node_modules/pm2/lib/API/Modules/NPM.js:166:3)
    at Modularizer.install (/usr/lib/node_modules/pm2/lib/API/Modules/Modularizer.js:48:9)
    at CLI.install (/usr/lib/node_modules/pm2/lib/API/Modules/index.js:27:17)
    at Command.<anonymous> (/usr/lib/node_modules/pm2/lib/binaries/CLI.js:503:9)
    at Command.listener (/usr/lib/node_modules/pm2/node_modules/commander/index.js:315:8) {

The recursive option for mkdirSync is available since Node.js 10.12.0. So this change should be safe for everybody.

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes

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