Core/Common: Fix typos

Found via `codespell -q 3 -S "./Externals,./Data/Sys/wiitdb-??.txt,*.po,*.pot" -L andf,asnd,bootup,brocken,bufferin,clen,collet,datas,delt,diety,extint,fpr,inout,inport,interm,nd,nin,ontop,pixelx,re-use,re-used,sav,stateman,strat,transer,wil`

Source/Core/Common/GL/GLExtensions/GLExtensions.cpp

@@ -2404,7 +2404,7 @@ static void InitExtensionList(GLContext* context)
     case 100:
       break;
     }
-    // So we can easily determine if we are running dekstop GL
+    // So we can easily determine if we are running desktop GL
     s_extension_list["VERSION_GL"] = true;
   }