Common: Don't return a reference to a string when calling GetName in symbols.cpp

Returning a copy of the string is what was likely meant to be done.

src/common/symbols.cpp

@@ -40,7 +40,7 @@ namespace Symbols
 
         return symbol;
     }
-    const std::string& GetName(u32 _address)
+    const std::string GetName(u32 _address)
     {
         return GetSymbol(_address).name;
     }

src/common/symbols.h

@@ -32,7 +32,7 @@ namespace Symbols
 
     void Add(u32 _address, const std::string& _name, u32 _size, u32 _type);
     TSymbol GetSymbol(u32 _address);
-    const std::string& GetName(u32 _address);
+    const std::string GetName(u32 _address);
     void Remove(u32 _address);
     void Clear();
 };