[Test][KiCad 7.0.8] Avoid diff between KiCad 6 and 7 files

- 7.0.8 seems to apply some adjust to v6 files

tests/test_plot/test_misc.py

@@ -1307,7 +1307,7 @@ def test_dont_stop_1(test_dir):
 def test_diff_file_1(test_dir):
     """ Difference between the current PCB and a reference file """
     prj = 'light_control_diff'
-    yaml = 'diff_file_'+('k5' if context.ki5() else 'k6')
+    yaml = f'diff_file_k{context.kicad_major}'
     ctx = context.TestContext(test_dir, prj, yaml)
     ctx.run()
     ctx.compare_pdf(prj+'-diff_pcb.pdf', reference='light_control-diff_pcb.pdf', off_y=OFFSET_Y, tol=DIFF_TOL)

tests/yaml_samples/diff_file_k7.kibot.yaml

@@ -0,0 +1,12 @@
+kibot:
+  version: 1
+
+outputs:
+  - name: 'diff_pcb'
+    comment: "PCB difference with reference file (KiCad 6)"
+    type: diff
+    layers: ['F.Cu', 'In1.Cu']
+    options:
+      old: tests/board_samples/kicad_7/light_control.kicad_pcb
+      old_type: file
+      cache_dir: .cache