Fix VFS.SubDirs VFS.RAW pattern matching

Consider a folder setup like this:
```
 base_dir
 ├ xxa
 ├ xxb
 └ yyc
```
and you want to find subfolders starting with "xx",
so you do `VFS.SubDirs("base_dir", "xx*", VFS.RAW)`.

The issue was that for `VFS.RAW`, the pattern was applied twice:
once during the actual filesystem search, where it correctly worked
on the filename only, and then a second time where it was applied
to the whole path (e.g. "base_dir/xxa" and not just "xxa"), so if
the pattern didn't happen to also match the initial folders, nothing
would be returned (although, most people seem to put a "*" wildcard
as the pattern, so it wasn't so bad since it does match the path).

Remove the second search since it is both redundant and incorrect.

rts/System/FileSystem/FileHandler.cpp

@@ -445,9 +445,6 @@ bool CFileHandler::InsertRawDirs(
 	dirSet.reserve(dirSet.size() + found.size());
 
 	for (std::string& dir: found) {
-		if (!spring::regex_match(dir, regexpattern))
-			continue;
-
 		dirSet.emplace_back(std::move(dir));
 	}
 #endif