[line-directives] fix failing tests

Author: facchinm

Diff for: src/arduino.cc/builder/test/sketch1/merged_sketch.txt

@@ -1,5 +1,5 @@
 #include <Arduino.h>
-#line 1
+#line 1 "{{EscapeBackSlashes .sketch.MainFile.Name}}"
 #line 1 "{{EscapeBackSlashes .sketch.MainFile.Name}}"
 void setup() {
 

Diff for: src/arduino.cc/builder/test/sketch2/SketchWithIfDef.resolved.directives.txt

@@ -1,5 +1,5 @@
 #include <Arduino.h>
-#line 1
+#line 1 "{{EscapeBackSlashes .sketch.MainFile.Name}}"
 #line 1 "{{EscapeBackSlashes .sketch.MainFile.Name}}"
 #define DEBUG 1
 #define DISABLED 0