MAME: edit the params in the es_systems instead of relying on a wrapper

[XargonWan]

This:

<command label="MAME (Standalone)">%STARTDIR%=~/.mame %EMULATOR_MAME% -rompath %GAMEDIR%\;%ROMPATH%/arcade %BASENAME%</command>

Could become:

<command label="MAME (Standalone)">%EMULATOR_MAME% -inipath /var/config/mame/ini -rompath %GAMEDIR%\;%ROMPATH%/arcade %BASENAME%</command>

And in this case the wrapper can be deleted:

• the file itself
• as es_find_rules entry
• in the manifest at the cp line

NOTE: check if this approach is viable for every other emulator which we're relying on a wrapper

[XargonWan]

Done: https://github.com/XargonWan/RetroDECK/commit/621d74a366ba32b2c1c4f5b751937d8d6a7a09d0