updated permissions and build process

Removed check for plasma in build.zig, it installs it anyways now
Added executable permissions for ghostty_dolphin.desktop since Plasma
requires them for context menu items

build.zig

@@ -573,12 +573,8 @@ pub fn build(b: *std.Build) !void {
             b.installFile("dist/linux/app.desktop", "share/applications/com.mitchellh.ghostty.desktop");
         }
 
-        // Right click menu action in case of Plasma desktop
-        if (env.get("DESKTOP_SESSION")) |desktop| {
-            if (std.mem.eql(u8, desktop, "plasma")) {
+        // Right click menu action for Plasma desktop
         b.installFile("dist/linux/ghostty_dolphin.desktop", "share/kio/servicemenus/com.mitchellh.ghostty.desktop");
-            }
-        }
 
         // Various icons that our application can use, including the icon
         // that will be used for the desktop.