generic: explicitly enable startup notification for all applications that support it

KRun, klauncher4, etc. no longer assume that applications support it nor
is it emulated for applications that do not - if applications do not
support it or do not do it correctly that's their problem

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

dolphin/src/dolphin.desktop

@@ -186,4 +186,5 @@ GenericName[zh_TW]=檔案管理員
 Terminal=false
 MimeType=inode/directory;
 InitialPreference=10
+StartupNotify=true
 X-KDE-MediaPlayer=informationpanel

kmail/kmail.desktop

@@ -8,3 +8,4 @@ Terminal=false
 Type=Application
 Categories=Qt;KDE;Network;Email;
 MimeType=x-scheme-handler/mailto;
+StartupNotify=true

kmediaplayer/kmediaplayer.desktop

@@ -8,4 +8,5 @@ Terminal=false
 Type=Application
 Categories=Qt;KDE;AudioVideo;Audio;Video;Player;TV;
 MimeType=application/ogg;application/x-ogg;application/sdp;application/smil;application/x-smil;application/streamingmedia;application/x-streamingmedia;application/vnd.rn-realmedia;application/vnd.rn-realmedia-vbr;audio/aac;audio/x-aac;audio/m4a;audio/x-m4a;audio/mp1;audio/x-mp1;audio/mp2;audio/x-mp2;audio/mp3;audio/x-mp3;audio/mpeg;audio/x-mpeg;audio/mpegurl;audio/x-mpegurl;audio/mpg;audio/x-mpg;audio/rn-mpeg;audio/ogg;audio/scpls;audio/x-scpls;audio/vnd.rn-realaudio;audio/wav;audio/x-pn-windows-pcm;audio/x-realaudio;audio/x-pn-realaudio;audio/x-ms-wma;audio/x-pls;audio/x-wav;video/mpeg;video/x-mpeg;video/x-mpeg2;video/mp4;video/msvideo;video/x-msvideo;video/ogg;video/quicktime;video/vnd.rn-realvideo;video/x-ms-afs;video/x-ms-asf;video/x-ms-wmv;video/x-ms-wmx;video/x-ms-wvxvideo;video/x-avi;video/x-fli;video/x-flv;video/x-theora;video/x-matroska;video/webm;audio/x-flac;audio/x-vorbis+ogg;video/x-ogm+ogg;audio/x-shorten;audio/x-ape;audio/x-wavpack;audio/x-tta;audio/AMR;audio/ac3;video/mp2t;audio/flac;audio/mp4;
+StartupNotify=true
 X-KDE-MediaPlayer=kmediaplayer