Fixed LFS tracking of BlocklyProp-Splash.png

Author: GitHub-Obex-Bot

.gitattributes

@@ -6,3 +6,4 @@ chromestore/* filter=lfs diff=lfs merge=lfs -text
 *.psd filter=lfs diff=lfs merge=lfs -text
 *.exe filter=lfs diff=lfs merge=lfs -text
 package/win-resources/nwjs/nwjs-v*.exe filter=lfs diff=lfs merge=lfs -text
+assets/BlocklyProp-Splash.png filter=lfs diff=lfs merge=lfs -text