Hopefully fix #1198 by removing original_pattern

original_pattern isn't actually RPG_RT behavior, apparently - the issue 1198 shows this.

I made a testcase, but not much of one.
 I had hoped to check different ways of setting the pattern,
 but apparently walking and page changes are the only things that do it.

So, test this with stuff before considering applying.
Thanks to Ghabry for basically doing most of the work.
The technical description given plus a look through the code showed original_pattern wasn't being honoured, and now I know why.

src/game_character.cpp

@@ -34,7 +34,6 @@
 Game_Character::Game_Character() :
 	tile_id(0),
 	pattern(RPG::EventPage::Frame_middle),
-	original_pattern(RPG::EventPage::Frame_middle),
 	last_pattern(0),
 	animation_id(0),
 	animation_type(RPG::EventPage::AnimType_non_continuous),
@@ -202,15 +201,15 @@ void Game_Character::UpdateSprite() {
 			anime_count++;
 	} else {
 		stop_count++;
-		if ((walk_animation && (IsSpinning() || IsContinuous())) || pattern != original_pattern)
+		if ((walk_animation && (IsSpinning() || IsContinuous())) || pattern != RPG::EventPage::Frame_middle)
 			anime_count++;
 	}
 
 	if (anime_count >= GetSteppingSpeed()) {
 		if (IsSpinning()) {
 			SetSpriteDirection((GetSpriteDirection() + 1) % 4);
 		} else if (!IsContinuous() && IsStopping()) {
-			pattern = original_pattern;
+			pattern = RPG::EventPage::Frame_middle;
 			last_pattern = last_pattern == RPG::EventPage::Frame_left ? RPG::EventPage::Frame_right : RPG::EventPage::Frame_left;
 		} else {
 			if (last_pattern == RPG::EventPage::Frame_left) {

src/game_character.h

@@ -687,7 +687,6 @@ class Game_Character {
 
 	int tile_id;
 	int pattern;
-	int original_pattern;
 	int last_pattern;
 	int animation_id;
 	int animation_type;

src/game_event.cpp

@@ -265,7 +265,6 @@ void Game_Event::Setup(const RPG::EventPage* new_page) {
 	tile_id = page->character_name.empty() ? page->character_index : 0;
 
 	pattern = page->character_pattern;
-	original_pattern = pattern;
 
 	move_type = page->move_type;
 	SetMoveSpeed(page->move_speed);
@@ -310,7 +309,6 @@ void Game_Event::SetupFromSave(const RPG::EventPage* new_page) {
 	tile_id = page->character_name.empty() ? page->character_index : 0;
 
 	pattern = page->character_pattern;
-	original_pattern = pattern;
 
 	move_type = page->move_type;
 	original_move_route = page->move_route;