Fix MT5 array declaration issues in OrdersEA_Smart_Grid

Changed dynamic arrays to fixed-size arrays:
- MqlRates rates[] -> rates[1]
- double rsiBuf[] -> rsiBuf[1]
- double adxBuf[] -> adxBuf[1]
- double atrBuf[] -> atrBuf[1]
- Removed ArraySetAsSeries calls (not needed for fixed arrays)

This fixes common 'array out of range' errors in MT5.

OrdersEA_Smart_Grid.mq5

@@ -119,8 +119,7 @@ bool    S1HitToday = false;
 //+------------------------------------------------------------------+
 void CalculatePivotPoints()
   {
-   MqlRates rates[];
-   ArraySetAsSeries(rates, true);
+   MqlRates rates[1];
    int copied = CopyRates(_Symbol, PERIOD_D1, 1, 1, rates);
    
    if(copied < 1)
@@ -144,8 +143,7 @@ void CalculatePivotPoints()
       double atr = 0;
       if(ATRHandle != INVALID_HANDLE)
         {
-         double atrBuf[];
-         ArraySetAsSeries(atrBuf, true);
+         double atrBuf[1];
          if(CopyBuffer(ATRHandle, 0, 0, 1, atrBuf) > 0)
             atr = atrBuf[0];
         }
@@ -173,8 +171,7 @@ bool IsRangingMarket()
    
    if(UseRSIFilter && RSIHandle != INVALID_HANDLE)
      {
-      double rsiBuf[];
-      ArraySetAsSeries(rsiBuf, true);
+      double rsiBuf[1];
       if(CopyBuffer(RSIHandle, 0, 0, 1, rsiBuf) > 0)
         {
          double rsi = rsiBuf[0];
@@ -188,8 +185,7 @@ bool IsRangingMarket()
    
    if(UseADXFilter && ADXHandle != INVALID_HANDLE && isRanging)
      {
-      double adxBuf[];
-      ArraySetAsSeries(adxBuf, true);
+      double adxBuf[1];
       if(CopyBuffer(ADXHandle, 0, 0, 1, adxBuf) > 0)
         {
          double adx = adxBuf[0];