Match around function could match trailing space

[mikkelfj]

At least with the C language and clangd language server, maf selects to exactly the closing '}' bracket. If this is cut and pasted, the result is rather messy. The solution is mafxx, one x to select the full line of the closing bracket, and one x to select the following blank line since functions are almost universally separated by at least one blank line.

It would be convenient if maf by its own would behave as mafxx.

I realize that mafxx is not always the best solution since it requires that there is in fact subsequent space, thus an implementation would need to be sensitive to that.