Revert "flatpak: Build with force-frame-pointers"

See rust-lang/rust#140832.

This reverts commit 75ec0b6.

Part-of: <https://gitlab.gnome.org/GNOME/snapshot/-/merge_requests/406>

Author: A6GibKm

build-aux/org.gnome.Snapshot.Devel.json

@@ -26,7 +26,6 @@
             "--share=network"
         ],
         "env": {
-            "RUSTFLAGS": "-C force-frame-pointers=yes",
             "CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER": "clang",
             "CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUSTFLAGS": "-C link-arg=-fuse-ld=/usr/lib/sdk/rust-stable/bin/mold",
             "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER": "clang",