swupdategui-rs: bump to de64c91

Pick up the fix for grid navigation: build.rs did not detect
lv_gridnav_add() in the LVGL bindings when rustfmt is not available,
as in a Yocto build. The GUI was built without grid navigation and the
keypad could not move the focus.

Signed-off-by: Stefano Babic <stefano.babic@swupdate.org>

recipes-support/rescuegui/swupdategui-rs_git.bb

@@ -11,7 +11,7 @@ SRC_URI = "git://github.com/sbabic/SWUpdateGUI.git;protocol=https;branch=rust-po
 	file://swupdate-gui.service \
 	file://90-recovery-gui.rules \
 	"
-SRCREV = "e904a5768fba63dc484d2fdc948ae10772406af9"
+SRCREV = "de64c91ea54671f25c47029cfcd36fc8a7a05a41"
 
 PV = "1.0.0+git"