[ivi-tct][webapi] Fix touch tests xml file multi total num

- Update tests.xml this multi-touch-interactions-manual.html total num

Impacted tests(approved): new 0, update 6, delete 0
Unit test platform: [android] crosswalk-10.38.222
Unit test result summary: pass 6, fail 0, block 0
Merge pull request #1517 from xinliux/touch/hot-fix

[ivi-tct][webapi] Fix touch tests xml file multi total num