Add const qualifiers to two foreach loop variables for consistency.

Also fix a vector include I happened to notice. Should be "<vector>" not "vector"

Source/Core/Core/GeckoCode.cpp

@@ -7,11 +7,11 @@
 #include "Thread.h"
 #include "HW/Memmap.h"
 #include "ConfigManager.h"
-
-#include "vector"
 #include "PowerPC/PowerPC.h"
 #include "CommonPaths.h"
 
+#include <vector>
+
 namespace Gecko
 {
 // return true if a code exists
@@ -97,11 +97,11 @@ bool InstallCodeHandler()
 
 	int i = 0;
 
-	for (GeckoCode& active_code : active_codes)
+	for (const GeckoCode& active_code : active_codes)
 	{
 		if (active_code.enabled)
 		{
-			for (GeckoCode::Code& code : active_code.codes)
+			for (const GeckoCode::Code& code : active_code.codes)
 			{
 				// Make sure we have enough memory to hold the code list
 				if ((codelist_location + 24 + i) < 0x80003000)