Updated splash and about screens (#1839)

Signed-off-by: Terry Michaels <miterenc@amazon.com>

Code/Editor/AboutDialog.cpp

@@ -45,7 +45,7 @@ CAboutDialog::CAboutDialog(QString versionText, QString richTextCopyrightNotice,
                     CAboutDialog > QLabel#link { text-decoration: underline; color: #94D2FF; }");
 
     // Prepare background image
-    QImage backgroundImage(QStringLiteral(":/StartupLogoDialog/splashscreen_background_gradient.jpg"));
+    QImage backgroundImage(QStringLiteral(":/StartupLogoDialog/splashscreen_background_developer_preview.jpg"));
     m_backgroundImage = QPixmap::fromImage(backgroundImage.scaled(m_enforcedWidth, m_enforcedHeight, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
 
     // Draw the Open 3D Engine logo from svg

Code/Editor/StartupLogoDialog.cpp

@@ -36,11 +36,11 @@ CStartupLogoDialog::CStartupLogoDialog(QString versionText, QString richTextCopy
  
     s_pLogoWindow = this;
 
-    m_backgroundImage = QPixmap(QStringLiteral(":/StartupLogoDialog/splashscreen_background_gradient.jpg"));
+    m_backgroundImage = QPixmap(QStringLiteral(":/StartupLogoDialog/splashscreen_background_developer_preview.jpg"));
     setFixedSize(QSize(600, 300));
 
     // Prepare background image
-    QImage backgroundImage(QStringLiteral(":/StartupLogoDialog/splashscreen_background_gradient.jpg"));
+    QImage backgroundImage(QStringLiteral(":/StartupLogoDialog/splashscreen_background_developer_preview.jpg"));
     m_backgroundImage = QPixmap::fromImage(backgroundImage.scaled(m_enforcedWidth, m_enforcedHeight, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
 
     // Draw the Open 3D Engine logo from svg

Code/Editor/StartupLogoDialog.qrc

@@ -1,6 +1,6 @@
 <RCC>
     <qresource prefix="/StartupLogoDialog">
         <file>o3de_logo.svg</file>
-        <file>splashscreen_background_gradient.jpg</file>
+        <file>splashscreen_background_developer_preview.jpg</file>
     </qresource>
 </RCC>

Code/Editor/splashscreen_background_developer_preview.jpg

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7105ec99477f124a8ac8d588f2dfc4ee7bb54f39386c8131b7703c86754c0cb8
+size 248690