[PR] Fix getDimFromCell trailing space for XSSF in-cell pictur e anchors [poi]

arimu1 opened a new pull request, #1211:
URL: https://github.com/apache/poi/pull/1211

   ## Summary
   - Fix `ImageUtils.getDimFromCell` when `hssfUnits == 0` (XSSF/OOXML anchors): use `endD` for trailing space instead of `dim - endD`, matching the semantics of the HSSF branch above it.
   - Add regression test for a single-cell XSSF anchor where zero offsets previously produced 0-sized dimensions and broke `picture.resize()`.
   
   Fixes #1201
   
   ## Test plan
   - [x] `./gradlew :poi-ooxml:test --tests org.apache.poi.xssf.usermodel.TestXSSFPicture.testGetDimensionFromAnchorSingleCell`
   - [x] `./gradlew :poi:test --tests org.apache.poi.ss.util.TestImageUtils`
   
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