X.A.Search: Remove num=100 from google search engine

It no longer does what it was intended to do, and in fact, now does the
opposite.

When X.A.Search came to be in ~2007, Google's default of showing 10 or
so search hits was radically inadequate for poweruser needs. The 'num'
argument was used to force display of more hits (i.e., n meant 'display
at least n hits per page').

However, at some point, 'num' was inverted to mean something
catastrophically different: now it apparently means 'display no more
than n hits, total'. If you use that parameter, you will get 1 or 2
pages of hits at most reading 'About 98 results' or 'About 99
results' (no matter how many millions are available), and a blurb at the
bottom of the final page saying 'In order to show you the most relevant
results, we have omitted some entries very similar to the 99 already
displayed.' Removing the 'num' parameter then shows you all the hits
that were suppressed.

This is bad, and should be removed.

Fixes: https://github.com/xmonad/xmonad-contrib/issues/642

Co-authored-by: Gwern Branwen <gwern@gwern.net>

XMonad/Actions/Search.hs

@@ -298,7 +298,7 @@ debpts        = searchEngine "debpts"        "https://packages.qa.debian.org/"
 dictionary    = searchEngine "dict"          "https://dictionary.reference.com/browse/"
 ebay          = searchEngine "ebay"          "https://www.ebay.com/sch/i.html?_nkw="
 github        = searchEngine "github"        "https://github.com/search?q="
-google        = searchEngine "google"        "https://www.google.com/search?num=100&q="
+google        = searchEngine "google"        "https://www.google.com/search?q="
 hackage       = searchEngine "hackage"       "https://hackage.haskell.org/package/"
 hoogle        = searchEngine "hoogle"        "https://hoogle.haskell.org/?hoogle="
 images        = searchEngine "images"        "https://images.google.fr/images?q="