Fix string-match arm in proc filter

[HyperSuperMetaCtrl]

When using bw cli my out put is ? Master password: [input is hidden] followed by some random characters insted of just ? Master password:.

This commit makes the string-match work with the output of my version of bw by also beeing compatible with the old format.

May be too broad though

[seanfarley]

Heh, this is probably what I meant originally; thanks for the fix!