fix theme return - Robuta Search

https://github.com/flarum/framework/pull/4405 [1.x] fix(theme): return Less_Tree_Keyword for boolean custom Less functions by imorland · Pull... Simple forum software for building great communities. - [1.x] fix(theme): return Less_Tree_Keyword for boolean custom Less functions by imorland · Pull Request... fix theme return less tree https://github.com/flarum/framework/pull/4406 [2.x] fix(theme): return Less_Tree_Keyword for boolean custom Less functions by imorland · Pull... Simple forum software for building great communities. - [2.x] fix(theme): return Less_Tree_Keyword for boolean custom Less functions by imorland · Pull Request... fix theme return less tree