Default theme - pics file permission executable

[zonkmachine]

As noticed by @gi0e5b06 the image files in the default theme has their permission set to executable.
I didn't even know this was tracked in git.
@Umcaruje @RebeccaLaVie

zonkmachine@zonkmachine:~/builds/lmms/lmms/data/themes/default$ ls -ail *
51643043 -rwxr-xr-x 1 zonkmachine zonkmachine    462 Jul 31 18:12 add_automation.png
51643097 -rwxr-xr-x 1 zonkmachine zonkmachine    216 Jul 31 18:12 add_bb_track.png
51648666 -rwxr-xr-x 1 zonkmachine zonkmachine    239 Jul 31 18:12 add_folder.png
51643039 -rwxr-xr-x 1 zonkmachine zonkmachine    232 Jul 31 18:12 add.png
51643103 -rwxr-xr-x 1 zonkmachine zonkmachine    261 Jul 31 18:12 add_sample_track.png
51643128 -rwxr-xr-x 1 zonkmachine zonkmachine    517 Jul 31 18:12 analysis.png

...

[zonkmachine]

I have a feeling there is a dedicated airhorn that will go off in the Debian headquarters the minute this hits Lintian.