fix: remove UTF-8 BOM from JSON example files (breaks PHP json_decode)

Author: scheilch

static/api/supporters/events/examples/donation_created_alex_1eur_followup.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 14421496,
     "amount": 1,

static/api/supporters/events/examples/donation_created_alex_1eur_note_hidden.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 14422721,
     "amount": 1,

static/api/supporters/events/examples/donation_created_alex_1eur_umlauts.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 14421781,
     "amount": 1,

static/api/supporters/events/examples/donation_created_alex_5eur_invalid_signature.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 14421406,
     "amount": 5,

static/api/supporters/events/examples/donation_created_jamie_1eur.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 14422773,
     "amount": 1,

static/api/supporters/events/examples/recurring_donation_cancelled_jamie.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 1020646,
     "amount": 1,

static/api/supporters/events/examples/recurring_donation_started_jamie.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 1020646,
     "amount": 1,

static/api/supporters/events/examples/recurring_donation_updated_jamie.json

@@ -1,4 +1,4 @@
-{
+{
   "data": {
     "id": 1020646,
     "amount": 1,