Resolve "Ouvrir / Enregistrer une session / une calculette"

Closes #45 (closed)

src/app/calculators/regime-uniforme/regime-uniforme.config.json

@@ -2,7 +2,6 @@
     {
         "id": "fs_section",
         "type": "fieldset",
-        "defaultNodeType": "SectionTrapeze",
         "option": "cal",
         "fields": [
             {
@@ -104,7 +103,6 @@
     {
         "id": "fs_bief",
         "type": "fieldset",
-        "defaultNodeType": "SectionTrapeze",
         "option": "cal",
         "fields": [
             {
@@ -127,7 +125,6 @@
     {
         "id": "fs_hydraulique",
         "type": "fieldset",
-        "defaultNodeType": "SectionTrapeze",
         "option": "cal",
         "fields": [
             {
@@ -145,7 +142,6 @@
     {
         "id": "fs_param_calc",
         "type": "fieldset",
-        "defaultNodeType": "SectionTrapeze",
         "option": "fix",
         "fields": [
             {