Fix Linux desktop files

There were too many backslashes in the Exec line.

Fixes #4367 <https://github.com/Genymobile/scrcpy/issues/4367>
PR #4448 <https://github.com/Genymobile/scrcpy/pull/4448>

Signed-off-by: Romain Vimont <rom@rom1v.com>

app/data/scrcpy-console.desktop

@@ -5,7 +5,7 @@ Comment=Display and control your Android device
 # For some users, the PATH or ADB environment variables are set from the shell
 # startup file, like .bashrc or .zshrc… Run an interactive shell to get
 # environment correctly initialized.
-Exec=/bin/sh -c "\"\\$SHELL\" -i -c scrcpy --pause-on-exit=if-error"
+Exec=/bin/sh -c "\"\$SHELL\" -i -c scrcpy --pause-on-exit=if-error"
 Icon=scrcpy
 Terminal=true
 Type=Application

app/data/scrcpy.desktop

@@ -5,7 +5,7 @@ Comment=Display and control your Android device
 # For some users, the PATH or ADB environment variables are set from the shell
 # startup file, like .bashrc or .zshrc… Run an interactive shell to get
 # environment correctly initialized.
-Exec=/bin/sh -c "\"\\$SHELL\" -i -c scrcpy"
+Exec=/bin/sh -c "\"\$SHELL\" -i -c scrcpy"
 Icon=scrcpy
 Terminal=false
 Type=Application