Use shell environment to execute launcher

Make Exec= compatible with $PATH configured in .bashrc or .zshrc…

PR #3351 <https://github.com/Genymobile/scrcpy/pull/3351>
Refs #296 <https://github.com/Genymobile/scrcpy/pull/296#discussion_r224987002>

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

app/data/scrcpy.desktop

@@ -2,7 +2,10 @@
 Name=scrcpy
 GenericName=Android Remote Control
 Comment=Display and control your Android device
-Exec=scrcpy
+# 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'
 Icon=scrcpy
 Terminal=false
 Type=Application