pidgin/pidgin

Rename gtkstyle.[ch] to pidginstyle.[ch] and fix up the dark mode check.

2020-11-10, Gary Kramlich
559881c7bf92
Rename gtkstyle.[ch] to pidginstyle.[ch] and fix up the dark mode check.

Testing Done:
* Ran with arc-dark and adwatia.
* Stepped through the debugger to make sure it was detected right.
* Joined a muc with both themes, the colors change but there're impossible to see as most of that code is elsewhere and not addressed in this review request.
* Also noticed that nicks in mucs are doubled, not sure what, but it's that way with out this patch as well.

Reviewed at https://reviews.imfreedom.org/r/208/
/* XPM */
static char * arrow_right_xpm[] = {
"16 13 30 1",
" c None",
". c #5C3566",
"+ c #613A6A",
"@ c #BC9FBB",
"# c #623B6B",
"$ c #D5BDD2",
"% c #C0A5BF",
"& c #623C6C",
"* c #D4BCD1",
"= c #C0A5C0",
"- c #D3BBD1",
"; c #D5BED3",
"> c #C2A6C1",
", c #623C6B",
"' c #C3A2C0",
") c #C3A1BF",
"! c #C2A1BF",
"~ c #C19FBE",
"{ c #C2A0BE",
"] c #D2B9CF",
"^ c #A787A8",
"/ c #5E3667",
"( c #D3BBD0",
"_ c #D4BDD2",
": c #AE81A9",
"< c #C7A8C3",
"[ c #BB9FBB",
"} c #603A6A",
"| c #C7A7C3",
"1 c #BDA1BC",
" . ",
" .+ ",
" .@# ",
" .$%# ",
".........&$*=# ",
".-$$$$$$$$*;*>, ",
".$'))))))!~~{]^/",
".(_______*!:<[} ",
".........&*|@+ ",
" ._1+ ",
" .@+ ",
" .+ ",
" . "};