richedit: fix misreporting of match offset for EM_FINDTEXT and EM_FINDTEXTEX

[Alex Villacís Lasso]

Forward search that spans across more than one run in a single paragraph
could report with an incorrect offset, due to the use of the last examined
run rather than the start-of-search run.

Changelog:
* Fix misreporting of match offset for EM_FINDTEXT and EM_FINDTEXTEX
* Added test that failed until bug was fixed.
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