Flatpak: rename Meshtastic -> MeshtasticD

[vidplace7]

This PR renames the Flatpak package from "Meshtastic" to "MeshtasticD".
With the introduction of "Meshtastic Desktop" on FlatHub, the meshtasticd flatpak could use a rename to be a bit less confusing.

This should also be cherrypicked to develop.

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⚡ Try this PR in the Web Flasher

Warning

This is an automated, unreviewed CI test build. Back up your device configuration
before flashing, and only flash devices you are able to recover.

Supported boards built by this PR (24)

	Device	Board	Platform
	Crowpanel Adv 3.5 TFT	elecrow-adv-35-tft	esp32-s3
	Heltec HT62	heltec-ht62-esp32c3-sx1262	esp32-c3
	Heltec Mesh Node 096	heltec-mesh-node-t096	nrf52840
	Heltec Mesh Node T1	heltec-mesh-node-t1	nrf52840
	Heltec Mesh Node T114	heltec-mesh-node-t114	nrf52840
	Heltec V3	heltec-v3	esp32-s3
	Meshnology W10	meshnology_w10	esp32-s3
	Raspberry Pi Pico	pico	rp2040
	Raspberry Pi Pico W	picow	rp2040
	RAK WisBlock 11200	rak11200	esp32
	RAK WisBlock 11310	rak11310	rp2040
	RAK3312	rak3312	esp32-s3
	RAK WisBlock 4631	rak4631	nrf52840
	Seeed SenseCAP Mesh-Tracker-X1	seeed_mesh_tracker_X1	nrf52840
	Seeed Xiao NRF52840 Kit	seeed_xiao_nrf52840_kit	nrf52840
	Seeed SenseCAP Indicator	seeed-sensecap-indicator-tft	esp32-s3
	Seeed Xiao ESP32-S3	seeed-xiao-s3	esp32-s3
	Station G2	station-g2	esp32-s3
	Station G3	station-g3	esp32-s3
	LILYGO T-Deck	t-deck-tft	esp32-s3
	LILYGO T-Echo	t-echo	nrf52840
	LILYGO T-Echo Plus	t-echo-plus	nrf52840
	LILYGO T-Impulse Plus	t-impulse-plus	nrf52840
	Seeed SenseCAP T1000-E	tracker-t1000-e	nrf52840

Build artifacts expire on 2026-08-08. Updated for 6daf504.

[vidplace7]