[locale] ru: simplify regex 
[locale] ru: simplify regex 

Only `[ \ ^ $ . | ? * + ( )` need to be escaped, so remove redundant `\` before `]`.
moment/moment,julionc/moment,mj1856/moment,PKRoma/moment,PKRoma/moment,mj1856/moment,PKRoma/moment,julionc/moment,ze-pequeno/moment,julionc/moment,moment/moment,ze-pequeno/moment,mj1856/moment,ze-pequeno/moment,moment/moment