git:core.pager: Update flags

Remove `-g` as it was put in place for a better experience with the
search pattern that `less` was started with.

Readd `-F` as it was explicitly unset when the search pattern was
introduced.

Do not readd `-X` as I like output that is too long (e.g. `log`, `show`)
to be kept in alternate mode and out of my scrollback buffer.

See:

- 17433d0528 ("git:core.pager: Remove the search pattern")

> This gets really annoying as it complains in many cases that it cannot
> find a match for the pattern when the pager is used for other things
> than commits.

- 093c3a6f9c ("git: Highlight current match in pager")

- 7e0e0f5baf ("git: Enable jumps between different files in diff")

> Jump between file sections and commits by using n and N. Taken from:
> https://github.com/so-fancy/diff-so-fancy/blob/eef379ee43f/pro-tips.md
>
> Remove FX flags since they are incompatible with the pattern search:
> When showing a small change that fits on less than the screen height,
> the rest of the screen is filled with ~ lines instead of quitting the
> pager. This behaviour is annoying and thus the flags are deactivated.
> Since git adds them per default they have to be explicitly disabled.

.config/git/config

@@ -29,7 +29,7 @@
 	verbose = true
 [core]
 	abbrev = 12
-	pager = diff-so-fancy | less --tabs=8 -Rg -+FX
+	pager = diff-so-fancy | less --tabs=8 -RF
 [diff]
 	submodule = log
 	tool = nvimdiff