Fix default arguments in `override`s which don't match the declaration

not enabling the relevant Analyzer rule MA0061 since that also triggers
when the override omits the default argument

src/BizHawk.Client.Common/Api/Classes/MemoryApi.cs

@@ -188,7 +188,8 @@ namespace BizHawk.Client.Common
 		public IReadOnlyCollection<string> GetMemoryDomainList()
 			=> DomainList.Select(static domain => domain.Name).ToList();
 
-		public uint GetMemoryDomainSize(string name = null) => (uint) NamedDomainOrCurrent(name).Size;
+		public uint GetMemoryDomainSize(string name)
+			=> (uint) NamedDomainOrCurrent(name).Size;
 
 		public string GetCurrentMemoryDomain() => Domain.Name;
 

src/BizHawk.Client.Common/Api/Classes/MovieApi.cs

@@ -55,7 +55,7 @@ namespace BizHawk.Client.Common
 			return lg.GenerateLogEntry();
 		}
 
-		public void Save(string filename = null)
+		public void Save(string filename)
 		{
 			if (_movieSession.Movie.NotActive())
 			{

src/BizHawk.Client.Common/Api/Classes/SQLiteApi.cs

@@ -51,7 +51,7 @@ namespace BizHawk.Client.Common
 			return "Database Opened Successfully";
 		}
 
-		public string WriteCommand(string query = null)
+		public string WriteCommand(string query)
 		{
 			if (string.IsNullOrWhiteSpace(query)) return "query is empty";
 			if (_dbConnection == null) return "Database not open.";
@@ -71,7 +71,7 @@ namespace BizHawk.Client.Common
 			return result;
 		}
 
-		public object ReadCommand(string query = null)
+		public object ReadCommand(string query)
 		{
 			if (string.IsNullOrWhiteSpace(query)) return "query is empty";
 			if (_dbConnection == null) return "Database not open.";