fix quotation style in npm run script for windows usage

[MasterOdin]

Before this change, got this error when running the dev script on Windows:

E:\Github\sqlectron-gui>npm run dev

> sqlectron@1.31.0 dev E:\Github\sqlectron-gui
> concurrently --names 'webpack,electron' --prefix name 'npm run dev:webpack' 'npm run dev:electron'

['webpack] 'np' is not recognized as an internal or external command,
['webpack] operable program or batch file.
[electron'] 'run' is not recognized as an internal or external command,
[electron'] operable program or batch file.
[] The filename, directory name, or volume label syntax is incorrect.
[] 'np' is not recognized as an internal or external command,
[] operable program or batch file.
[] 'run' is not recognized as an internal or external command,
[] operable program or batch file.
[] The filename, directory name, or volume label syntax is incorrect.
[] run exited with code 1
[] np exited with code 1
[] dev:webpack' exited with code 1
[electron'] run exited with code 1
['webpack] np exited with code 1
[] dev:electron' exited with code 1
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sqlectron@1.31.0 dev: `concurrently --names 'webpack,electron' --prefix name 'npm run dev:webpack' 'npm run dev:electron'`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the sqlectron@1.31.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\mpeveler\AppData\Roaming\npm-cache\_logs\2020-08-25T23_08_37_933Z-debug.log