[Fix] Prevent last run output to leak to next run's logs

[arielj]

There is a small an inoffensive bug with gog games and logs, but it can cause confusion during support requests:
the gogdl command prints the launch command to the output a moment after the process ends, when a game launch is aborted, this happens AFTER Heroic calls the stopLogger method. This causes a new logger to be initialized with that last message in the queue, and it's used in the next run, printing a message from a previous run before the actual run's logs.

This PR fixes that by only initializing the logger when calling initGameLog and not on appends.

This is how this can be tested in the current release:

• start a GOG game
• abort the launch as soon as possible
• launch the game again
• now let it start and close the game correctly
• open the game logs

Notice that there are 2 Launch command lines in the log:

Launch command: ['/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/bin/wine', "/home/ariel/Games/Heroic/Alwa's Awakening/AlwasAwakening.exe"]

Launch Command: HEROIC_APP_NAME=1396087560 HEROIC_APP_RUNNER=gog HEROIC_APP_SOURCE=gog LD_PRELOAD= DOTNET_BUNDLE_EXTRACT_BASE_DIR= DOTNET_ROOT= WINEPREFIX="/home/ariel/Games/Heroic/Prefixes/Alwas Awakening" WINEDLLOVERRIDES=winemenubuilder.exe=d WINE_FULLSCREEN_FSR=0 WINEESYNC=1 WINEFSYNC=1 ORIG_LD_LIBRARY_PATH= LD_LIBRARY_PATH=/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/lib64:/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/lib GST_PLUGIN_SYSTEM_PATH_1_0=/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/lib64/gstreamer-1.0:/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/lib/gstreamer-1.0 WINEDLLPATH=/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/lib64/wine:/home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/lib/wine /home/ariel/dev/oss/HeroicGamesLauncher/public/bin/linux/gogdl launch "/home/ariel/Games/Heroic/Alwa's Awakening" 1396087560 --wine /home/ariel/.config/heroic/tools/wine/Wine-GE-Proton8-25/bin/wine --platform windows

First line is the last output of gogdl.
Second line is the actual launch command from the current run printed by Heroic.

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)