Fix research sync applying progress to wrong level

When the level of a technology changes either by setting level
directly or by setting researched to true, the saved progress of the
research is reset only if the technology is not the current research.

If during the initial synchronisation with the controller an instance
has progressed on a multi level research, it's the current research, and
the controller's level of that research is higher, then the level is set
to the higher level and the game keeps the progress.  This in turn
results in all of the progress made on the previous level being added to
the higher level.

Fix by setting the progress to zero when changing the level or
researched status of a technology that's the active research.

CHANGELOG.md

@@ -10,6 +10,7 @@
 - Fixed an error thrown in the rendering of one page in the Web UI causing all pages to become inaccessible.
 - Fixed Web UI not showing instance saves when the permission to list and subscribe the saves is granted but the user is not a cluster admin.
 - Similarly fixed Web UI not showing the mod pack create, delete, list and host revoke token actions if the user is not a cluster admin.
+- Fixed Research Sync applying progress of a previous techology level to the level on the controller when it's the active research during instance startup.
 
 
 ## Version 2.0.0-alpha.16

plugins/research_sync/module/sync.lua

@@ -137,10 +137,21 @@ function research_sync.sync_technologies(data)
 	for _, tech_data in pairs(game.json_to_table(data)) do
 		local tech = force.technologies[tech_data[nameIndex]]
 		if tech and tech.level <= tech_data[levelIndex] then
-			tech.level = math.min(tech_data[levelIndex], tech.prototype.max_level)
+			local new_level = math.min(tech_data[levelIndex], tech.prototype.max_level)
+			if new_level ~= tech.level then
+				-- when the level of the current research changes the
+				-- progress is not automatically reset.
+				if force.current_research == tech then
+					force.research_progress = 0
+				end
+				tech.level = new_level
+			end
 
 			local progress
 			if tech_data[researchedIndex] then
+				if force.current_research == tech then
+					force.research_progress = 0
+				end
 				tech.researched = true
 				progress = nil
 			elseif tech_data[progressIndex] then