Fixed Material Editor not launching (#1920)

* Fixed Material Editor not launching

Explicitly providing project-path as part of launch parameters.

Signed-off-by: Lloyd Tullues <lloyd@carbonated.com>

* Update Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialSystemComponent.cpp

Co-authored-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>
Signed-off-by: Lloyd Tullues <lloyd@carbonated.com>

* Minor - adding whitespace for consistency

Signed-off-by: Lloyd Tullues <lloyd@carbonated.com>

Co-authored-by: Lloyd Tullues <lloyd@carbonated.com>
Co-authored-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialSystemComponent.cpp

@@ -130,6 +130,12 @@ namespace AZ
                 arguments.append(QString("--rhi=%1").arg(apiName.GetCStr()));
             }
 
+            AZ::IO::FixedMaxPathString projectPath(AZ::Utils::GetProjectPath());
+            if (!projectPath.empty())
+            {
+                arguments.append(QString("--project-path=%1").arg(projectPath.c_str()));
+            }
+
             AtomToolsFramework::LaunchTool("MaterialEditor", ".exe", arguments);
         }