C++: Fix mixed tabs and spaces in non-test code

cpp/ql/src/Likely Bugs/NestedLoopSameVar.cpp

@@ -1,16 +1,16 @@
 int x1 = 0;
 for (x1 = 0; x1 < 100; x1++) {
-	int x2 = 0;
-	for (x1 = 0; x1 < 300; x1++) {
+    int x2 = 0;
+    for (x1 = 0; x1 < 300; x1++) {
     // this is most likely a typo
     // the outer loop will exit immediately
-	} 
+    } 
 }
 
 for (x1 = 0; x1 < 100; x1++) {
   if(x1 == 10 && condition) {
-  	for (; x1 < 75; x1++) {
+    for (; x1 < 75; x1++) {
       // this should be written as a while loop
-  	}   
+    }   
   }
 }