Backends: WebGPU: Fix missing initialization of local variable (#4634)

backends/imgui_impl_wgpu.cpp

diff --git a/backends/imgui_impl_wgpu.cpp b/backends/imgui_impl_wgpu.cpp
index 20b6bb2..2f621ed 100644
--- a/backends/imgui_impl_wgpu.cpp
+++ b/backends/imgui_impl_wgpu.cpp
@@ -270,7 +270,7 @@
     spirv_desc.codeSize = binary_data_size;
     spirv_desc.code = binary_data;
 
-    WGPUShaderModuleDescriptor desc;
+    WGPUShaderModuleDescriptor desc = {};
     desc.nextInChain = reinterpret_cast<WGPUChainedStruct*>(&spirv_desc);
 
     WGPUProgrammableStageDescriptor stage_desc = {};