Fix path on ui_optionsdialog.h to make QtCtreator happy #1745

Job	Run time
macOS 11 native [GOAL install] [GUI] [no depends]	13m 18s
Lint	1m 2s
ARM [GOAL install] [buster]	3m 42s
Win32	5m 47s
Win64	5m 59s
i386 Linux [GOAL install] [focal]	2m 53s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	26m 18s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	18m 10s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	13m 29s
	1h 30m 38s

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