bugfix: IfW rotor points for disk average incorrect #1167

Job	Run time
build-all-debug	4m 38s
build-all-debug-single	3m 14s
build-postlib-release	9m 13s
build-drivers-release	4m 59s
build-test-uadriver-debug	2m 1s
rtest-modules-debug	4m 35s
rtest-module-drivers	2m 9s
build-interfaces-release	3m 32s
build-fastfarm-release	10m 41s
build-openfast-release	3m 26s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 32s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 23s
rtest-OF	6m 43s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	3m 7s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 38s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	59s
rtest-OF-linearization	3m 56s
rtest-interfaces	3m 10s
rtest-FF	2m 2s
	1h 16m 58s

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