shader/other: Reduce DEPBAR log severity

While DEPBAR is stubbed it doesn't change anything from our end. Shading
languages handle what this instruction does implicitly. We are not
getting anything out fo this log except noise.

src/video_core/shader/decode/other.cpp

@@ -256,7 +256,7 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
         break;
     }
     case OpCode::Id::DEPBAR: {
-        LOG_WARNING(HW_GPU, "DEPBAR instruction is stubbed");
+        LOG_DEBUG(HW_GPU, "DEPBAR instruction is stubbed");
         break;
     }
     default: