effects: Remove outdated ksplash window class strings

ksplash nowadays has only "ksplashqml ksplashqml" window class.

src/effects/fade/package/contents/code/main.js

@@ -14,9 +14,7 @@ var blacklist = [
     "ksmserver-logout-greeter ksmserver-logout-greeter",
 
     // The splash screen has to be animated only by the login effect.
-    "ksplashqml ksplashqml",
-    "ksplashsimple ksplashsimple",
-    "ksplashx ksplashx"
+    "ksplashqml ksplashqml"
 ];
 
 function isFadeWindow(w) {

src/effects/fadingpopups/package/contents/code/main.js

@@ -15,9 +15,7 @@ var blacklist = [
     "ksmserver-logout-greeter ksmserver-logout-greeter",
 
     // KDE Plasma splash screen has to be animated only by the login effect.
-    "ksplashqml ksplashqml",
-    "ksplashsimple ksplashsimple",
-    "ksplashx ksplashx"
+    "ksplashqml ksplashqml"
 ];
 
 function isPopupWindow(window) {

src/effects/glide/glide.cpp

@@ -27,8 +27,6 @@ static const QSet<QString> s_blacklist {
     QStringLiteral("ksmserver ksmserver"),
     QStringLiteral("ksmserver-logout-greeter ksmserver-logout-greeter"),
     QStringLiteral("ksplashqml ksplashqml"),
-    QStringLiteral("ksplashsimple ksplashsimple"),
-    QStringLiteral("ksplashx ksplashx")
 };
 
 GlideEffect::GlideEffect()

src/effects/login/package/contents/code/main.js

@@ -17,17 +17,7 @@ var loginEffect = {
         loginEffect.isFadeToBlack = effect.readConfig("FadeToBlack", false);
     },
     isLoginSplash: function (window) {
-        var windowClass = window.windowClass;
-        if (windowClass === "ksplashx ksplashx") {
-            return true;
-        }
-        if (windowClass === "ksplashsimple ksplashsimple") {
-            return true;
-        }
-        if (windowClass === "ksplashqml ksplashqml") {
-            return true;
-        }
-        return false;
+        return window.windowClass === "ksplashqml ksplashqml";
     },
     fadeOut: function (window) {
         animate({

src/effects/scale/package/contents/code/main.js

@@ -15,9 +15,7 @@ var blacklist = [
     "ksmserver-logout-greeter ksmserver-logout-greeter",
 
     // KDE Plasma splash screen has to be animated only by the login effect.
-    "ksplashqml ksplashqml",
-    "ksplashsimple ksplashsimple",
-    "ksplashx ksplashx"
+    "ksplashqml ksplashqml"
 ];
 
 var scaleEffect = {