[0.4.9][SHELL32_WINETEST] Fix 2 MSVC warnings about flags CORE-7538

[0.4.9][SHELL32_WINETEST] Fix 2 MSVC warnings about flags CORE-7538

Can be observed when building with MSVC2010SP1 x86-target in dbg config:
- "...\ebrowser.c(1188) : warning C4133: 'function' : incompatible types - from 'DWORD *' to 'EXPLORER_BROWSER_OPTIONS *'"
- "...\ebrowser.c(1198) : warning C4133: 'function' : incompatible types - from 'DWORD *' to 'EXPLORER_BROWSER_OPTIONS *'"

Cherry-pick https://source.winehq.org/git/wine.git/commit/535f2f9e663b7b3db3147960942d3b4934e1ce07

fix picked from:
0.4.10-dev-513-g 669d6b445bdf3c20746268efea00c730c6b74706