[deps] Fix the name of activate_emsdk

activate_emsdk_linux used to be Linux specific due to platform-specific
LLVM and Node dependencies, but I removed those and made this
platform-agnostic and forgot to rename it.

Bug: 371024051
Change-Id: Idf852f88b2523087e3618593b126df5a518b2888
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/252257
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
diff --git a/DEPS b/DEPS
index 33b78c3..e91ee56 100644
--- a/DEPS
+++ b/DEPS
@@ -672,7 +672,7 @@
 
   # Activate emsdk for WebAssembly builds
   {
-    'name': 'activate_emsdk_linux',
+    'name': 'activate_emsdk',
     'pattern': '.',
     'condition': 'dawn_wasm',
     'action': [ 'python3', 'tools/activate-emsdk' ],