Steam shortcut - remove forced compatibility tool

[SilentException]

For the created Steam shortcut that points to palia_steam_helper.sh there is no need to force compatibility tool - it only creates unneeded Proton prefix. The proton stuff is done by the script which is run natively.

install_palia.sh

• removed setting Proton Experimental for newly created shortcut

palia_steam_helper.sh

• moved logging initialization further up so that we can log environment or errors during initialization
• added some comments regarding setting specific environment variables
• allow user to request specific proton compatibility data folder (instead of using ./steam) with PALIA_COMPAT_DATA_PATH environment variable