Fix typo in `get_xft_dpi` #50

Job	Run time
Check formatting	4s
Run cargo-deny on Android	21s
Run cargo-deny on iOS	20s
Run cargo-deny on Linux	21s
Run cargo-deny on macOS	21s
Test stable Windows 64bit MSVC	2m 39s
Run cargo-deny on Redox OS	25s
Test stable Windows 32bit MSVC	3m 5s
Run cargo-deny on web	24s
Test stable Windows 64bit GNU	2m 44s
Run cargo-deny on Windows	22s
Test stable Windows 32bit GNU	2m 21s
Test stable Linux 32bit	3m 27s
Test stable Linux 64bit	3m 0s
Test stable X11	2m 30s
Test stable Wayland	2m 11s
Test stable Android	51s
Test stable Redox OS	20s
Test stable macOS	1m 55s
Test stable iOS x86_64	1m 14s
Test stable iOS Aarch64	1m 17s
Test stable web	1m 2s
Test nightly Windows 64bit MSVC	1m 33s
Test nightly Windows 32bit MSVC	1m 31s
Test nightly Windows 64bit GNU	2m 13s
Test nightly Windows 32bit GNU	2m 13s
Test nightly Linux 32bit	2m 47s
Test nightly Linux 64bit	2m 28s
Test nightly X11	2m 23s
Test nightly Wayland	2m 7s
Test nightly Android	53s
Test nightly Redox OS	17s
Test nightly macOS	1m 44s
Test nightly iOS x86_64	1m 29s
Test nightly iOS Aarch64	1m 15s
Test nightly web	54s
Test 1.65.0 Windows 64bit MSVC	57s
Test 1.65.0 Windows 32bit MSVC	1m 3s
Test 1.65.0 Windows 64bit GNU	1m 4s
Test 1.65.0 Windows 32bit GNU	58s
Test 1.65.0 Linux 32bit	1m 27s
Test 1.65.0 Linux 64bit	1m 11s
Test 1.65.0 X11	54s
Test 1.65.0 Wayland	44s
Test 1.65.0 Redox OS	19s
Test 1.65.0 macOS	1m 1s
Test 1.65.0 iOS x86_64	1m 6s
Test 1.65.0 iOS Aarch64	58s
Test 1.65.0 web	39s
Test 1.69.0 Android	1m 4s
	1h 8m 26s

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