plugins: fix install path #4207

Job	Run time
coverage (ubuntu-20.04)	5m 56s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	6m 20s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 44s
ubuntu-20.04 (package, non-mavsdk_server)	7m 45s
ubuntu-22.04 (package, non-mavsdk_server)	5m 39s
ubuntu-20.04 (mavsdk, hunter)	4m 46s
ubuntu-24.04 (style and proto check)	1m 34s
ubuntu-24.04 (package, non-mavsdk_server)	6m 41s
ubuntu-20.04 (mavsdk_server, superbuild)	13m 34s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 45s
alpine 3.19.0 (musl)	10m 54s
android-arm	6m 34s
ubuntu-24.04 (mavsdk_server, superbuild)	12m 13s
linux-armv6	6m 55s
android-arm64	6m 49s
ubuntu-24.04 (mavsdk_server, superbuild)	13m 11s
linux-armv6-musl	12m 39s
android-x86	6m 30s
ubuntu-24.04 (mavsdk_server, superbuild)	13m 11s
linux-armv7	6m 44s
linux-armv7l-musl	12m 32s
android-x86_64	6m 48s
linux-arm64-musl	13m 31s
linux-arm64	6m 0s
ios	1h 12m 50s
linux-arm64-lts	5m 19s
macOS x64	39m 54s
Windows	12m 26s
ios_simulator_x64	5m 56s
macOS arm64	18m 49s
ios_simulator_arm64	1h 15m 9s
macOS framework x64	39m 56s
macOS framework arm64	20m 16s
iOS XCFramework	1m 33s
	8h 18m 23s

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