cata_tiles: fix variant vehicle parts to work with ASCIITiles

Fixes CleverRaven#44711

In the conversion of vehicle parts to variants, the fallback
code for ASCIITiles was still using the raw vehicle part id,
not the split vehicle part id with variant.  This caused all
variant vehicle parts to be unidentified in ASCIITILES.

Fix the issue by breaking up the vehicle part into its variant
string, and if a variant part is present, getting the symbol
from the symbols array.

src/cata_tiles.cpp

@@ -1726,7 +1726,9 @@ bool cata_tiles::draw_from_id_string( const std::string &id, TILE_CATEGORY categ
                 col = mt.color;
             }
         } else if( category == C_VEHICLE_PART ) {
-            const vpart_id vpid( found_id.substr( 3 ) );
+            const std::pair<std::string,
+                  std::string> &vpid_data = get_vpart_str_variant( found_id.substr( 3 ) );
+            const vpart_id vpid( vpid_data.first );
             if( vpid.is_valid() ) {
                 const vpart_info &v = vpid.obj();
 
@@ -1736,6 +1738,12 @@ bool cata_tiles::draw_from_id_string( const std::string &id, TILE_CATEGORY categ
                     sym = v.sym_broken;
                 } else {
                     sym = v.sym;
+                    if( !vpid_data.second.empty() ) {
+                        const auto &var_data = v.symbols.find( vpid_data.second );
+                        if( var_data != v.symbols.end() ) {
+                            sym = var_data->second;
+                        }
+                    }
                 }
                 subtile = -1;