ci: pass the src directory to 'zig fmt' (#20114)

Co-authored-by: nektro <5464072+nektro@users.noreply.github.com>

src/cli/test_command.zig

@@ -9,7 +9,6 @@ const default_allocator = bun.default_allocator;
 
 const std = @import("std");
 
-
 const FileSystem = @import("../fs.zig").FileSystem;
 const options = @import("../options.zig");
 const js_ast = bun.JSAst;