[clang] [clang-repl] Remove redundant shared flag while running clang-repl in browser (PR #118107)

[Anutosh Bhat via cfe-commits]

anutosh491 wrote:

cc @vgvassilev 

Now that 19.1.5 is out. We can run clang-repl in the browser. And this flag is just adding redundancy and doesn't play a role. 
Small change. Should be ready !

https://github.com/llvm/llvm-project/pull/118107