Fixed profile string per request in pr#4268 (shader-slang#4297)

Changed profile string from glsl_440 to spirv_1_5 per request in
pr#4268.

Author: chaoticbob

examples/hello-world/main.cpp

@@ -114,7 +114,7 @@ int HelloWorldExample::createComputePipelineFromShader()
     slang::SessionDesc sessionDesc = {};
     slang::TargetDesc targetDesc = {};
     targetDesc.format = SLANG_SPIRV;
-    targetDesc.profile = slangGlobalSession->findProfile("glsl_440");
+    targetDesc.profile = slangGlobalSession->findProfile("spirv_1_5");
     targetDesc.flags = SLANG_TARGET_FLAG_GENERATE_SPIRV_DIRECTLY;
 
     sessionDesc.targets = &targetDesc;