[vulkan] Fix blend constants encoding error

bug: 111137294

Wow :)

Change-Id: I724b0a641b22495897b72db19b2e2771a96689fc
diff --git a/system/vulkan/func_table.cpp b/system/vulkan/func_table.cpp
index 14c8c32..44e385d 100644
--- a/system/vulkan/func_table.cpp
+++ b/system/vulkan/func_table.cpp
@@ -1095,7 +1095,7 @@
 }
 static void entry_vkCmdSetBlendConstants(
     VkCommandBuffer commandBuffer,
-    const float blendConstants)
+    const float blendConstants[4])
 {
     AEMU_SCOPED_TRACE("vkCmdSetBlendConstants");
     auto vkEnc = HostConnection::get()->vkEncoder();