Adjust modem volume to more closely match system volume

This patch increases the volume from calls (incoming volume, so from the
person calling you) by 50% to bring the call volume to be similar to
that of what you get from the system volume.

default/audio/pulse/librem5.pa

@@ -11,6 +11,7 @@ update-source-proplist alsa_input.platform-sound.HiFi__hw_Devkit_0__source filte
 # phone
 .ifexists /sys/devices/platform/sound-wwan/30030000.sai-bm818
 load-module module-alsa-card device_id="Modem" name="platform-sound-wwan" card_properties="device.description=Modem"
+set-source-volume alsa_input.platform-sound-wwan.stereo-fallback 98304
 .endif
 
 .ifexists /sys/devices/platform/sound/308b0000.sai-wm8962