removes executable bit on files that do not need it

[mathieu-aubin]

this was done manually to the best of my knowledge, it shouldn't have messed with files that need to be executables (hopefully)

I understand its a big load of files but if you look carefuly, the cotent of the files have not changed one bit.

[JotaRandom]

Thanks, The original problem was a mismahandling way back from when btrfs was new and I was naïvé