Fix incorrect glslang git hash.

Bug: angleproject:3227
Change-Id: I3bbdb6956cf97298eff9bd2a766d048f1de4a70f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1531538
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

scripts/run_code_generation_hashes.json

@@ -304,7 +304,7 @@
   "Vulkan internal shader programs:src/libANGLE/renderer/vulkan/vk_internal_shaders_autogen.h":
     "e70f3fa32f5ff0e567ce4ed2a5dc759e",
   "Vulkan internal shader programs:third_party/glslang/src/.git/HEAD":
-    "4cf2d64e44205fe628ddd534e1151b58",
+    "df49e235d26f2cb00f8045c80d5478bb",
   "Vulkan mandatory format support table:src/libANGLE/renderer/angle_format.py":
     "b18ca0fe4835114a4a2f54977b19e798",
   "Vulkan mandatory format support table:src/libANGLE/renderer/vulkan/gen_vk_mandatory_format_support_table.py":