Fix emscripten_releases directory name to match git repo name

Change-Id: I7c21a84ad1e2eccbb147b47d8372d3daefda7beb
Recipe-Nontrivial-Roll: build
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1570846
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Nodir Turakulov <nodir@chromium.org>
Auto-Submit: Derek Schuff <dschuff@chromium.org>

recipes/recipe_modules/gclient/config.py

@@ -153,10 +153,10 @@ def wasm_llvm(c):
 @config_ctx()
 def emscripten_releases(c):
   s = c.solutions.add()
-  s.name = 'emscripten_releases'
+  s.name = 'emscripten-releases'
   s.url = ChromiumGitURL(c, 'emscripten-releases.git')
   m = c.got_revision_mapping
-  m['emscripten_releases'] = 'got_revision'
+  m['emscripten-releases'] = 'got_revision'
 
 @config_ctx()
 def gyp(c):