rename logos with dark_mode and light_mode postfix

desktop/src/main/java/haveno/desktop/app/HavenoAppMain.java

@@ -216,7 +216,7 @@ public class HavenoAppMain extends HavenoExecutable {
 
             // Set the dialog content
             VBox vbox = new VBox(10);
-            ImageView logoImageView = new ImageView(ImageUtil.getImageByPath("logo_splash_light.png"));
+            ImageView logoImageView = new ImageView(ImageUtil.getImageByPath("logo_splash_light_mode.png"));
             logoImageView.setFitWidth(342);
             logoImageView.setPreserveRatio(true);
             vbox.getChildren().addAll(logoImageView, passwordField, errorMessageField, versionField);

desktop/src/main/java/haveno/desktop/theme-dark.css

@@ -578,15 +578,15 @@
 }
 
 #image-logo-splash {
-    -fx-image: url("../../images/logo_splash_dark.png");
+    -fx-image: url("../../images/logo_splash_dark_mode.png");
 }
 
 #image-logo-splash-testnet {
-    -fx-image: url("../../images/logo_splash_testnet_dark.png");
+    -fx-image: url("../../images/logo_splash_testnet_dark_mode.png");
 }
 
 #image-logo-landscape {
-    -fx-image: url("../../images/logo_landscape_dark.png");
+    -fx-image: url("../../images/logo_landscape_dark_mode.png");
 }
 
 .table-view .placeholder {

desktop/src/main/java/haveno/desktop/theme-light.css

@@ -144,15 +144,15 @@
 }
 
 #image-logo-splash {
-    -fx-image: url("../../images/logo_splash_light.png");
+    -fx-image: url("../../images/logo_splash_light_mode.png");
 }
 
 #image-logo-splash-testnet {
-    -fx-image: url("../../images/logo_splash_testnet_light.png");
+    -fx-image: url("../../images/logo_splash_testnet_light_mode.png");
 }
 
 #image-logo-landscape {
-    -fx-image: url("../../images/logo_landscape_light.png");
+    -fx-image: url("../../images/logo_landscape_light_mode.png");
 }
 
 #charts .default-color0.chart-series-area-fill {