Remove test `Extraction_eddies_region_1`

There is no significant difference with
`Extraction_eddies_region_1_noise`: no impact of `min_amp` on this
region. For an impact of `min_amp`, compare tests
`Extraction_eddies_region_3` and `Extraction_eddies_region_3_min`.

Inst_eddies/Tests/short_tests.json

@@ -241,31 +241,7 @@
 	],
 	"input": "f\n"
     },
-    "Extraction_eddies_region_1":
-    {
-	"create_file": [
-            "config_nml.txt",
-            "&config_nml min_amp = 0./\n"
-	],
-	"input": "&dates_nml date = 20454/\n",
-	"commands":
-	[
-            [
-		"mkdir",
-		"-p",
-		"SHPC/Slice_0/Cyclones",
-		"SHPC/Slice_0/Anticyclones"
-            ],
-            [
-		"$build_dir/Inst_eddies/inst_eddies",
-		"$src_dir/Inst_eddies/Tests/Input/Region_1/huv_region_1_2006_01_01.nc",
-		"$src_dir/Inst_eddies/Tests/Input/Region_1/huv_region_1_2006_01_01.nc"
-            ]
-	],
-	"exclude_cmp": ["timings.txt"]
-    },
     "Extraction_eddies_region_1_noise": {
-	"description": "Same as Extraction_eddies_region_1 but with non-zero minimal amplitude.",
 	"create_file": [
             "config_nml.txt",
             "&config_nml /\n"