Update Steam path detection for Linux (#21948)

* Update Steam path detection for Linux

As Steam now uses Proton to install Windows version natively, update
paths so they get found automatically

* Use new Steam path detection on Linux only

This restores Steam path detection on macOS as it doesn't have Proton

src/openrct2/platform/Platform.Android.cpp

@@ -151,6 +151,16 @@ namespace Platform
         return {};
     }
 
+    u8string GetRCT1SteamDir()
+    {
+        return {};
+    }
+
+    u8string GetRCT2SteamDir()
+    {
+        return {};
+    }
+
 #    ifndef NO_TTF
     std::string GetFontPath(const TTFFontDescriptor& font)
     {

src/openrct2/platform/Platform.Linux.cpp

@@ -299,21 +299,38 @@ namespace Platform
             return {};
         }
 
-        auto steamPath = Path::Combine(homeDir, u8".local/share/Steam/ubuntu12_32/steamapps/content");
+        // Prefer new path for Steam, which is the default when using with Proton
+        auto steamPath = Path::Combine(homeDir, u8".local/share/Steam/steamapps/common");
         if (Path::DirectoryExists(steamPath))
         {
             return steamPath;
         }
 
-        steamPath = Path::Combine(homeDir, u8".steam/steam/ubuntu12_32/steamapps/content");
+        // Fallback paths
+        steamPath = Path::Combine(homeDir, u8".local/share/Steam/ubuntu12_32/steamapps/content");
         if (Path::DirectoryExists(steamPath))
         {
             return steamPath;
         }
 
+        steamPath = Path::Combine(homeDir, u8".steam/steam/ubuntu12_32/steamapps/content");
+        if (Path::DirectoryExists(steamPath))
+        {
+            return steamPath;
+        }
         return {};
     }
 
+    u8string GetRCT1SteamDir()
+    {
+        return u8"Rollercoaster Tycoon Deluxe";
+    }
+
+    u8string GetRCT2SteamDir()
+    {
+        return u8"Rollercoaster Tycoon 2";
+    }
+
 #    ifndef NO_TTF
     std::string GetFontPath(const TTFFontDescriptor& font)
     {

src/openrct2/platform/Platform.Posix.cpp

@@ -369,17 +369,6 @@ namespace Platform
         datetime64 utcNow = epochAsTicks + utcEpochTicks;
         return utcNow;
     }
-
-    u8string GetRCT1SteamDir()
-    {
-        return u8"app_285310" PATH_SEPARATOR u8"depot_285311";
-    }
-
-    u8string GetRCT2SteamDir()
-    {
-        return u8"app_285330" PATH_SEPARATOR u8"depot_285331";
-    }
-
 } // namespace Platform
 
 #endif

src/openrct2/platform/Platform.macOS.mm

@@ -252,6 +252,16 @@ MeasurementFormat GetLocaleMeasurementFormat()
         return {};
     }
 
+    u8string GetRCT1SteamDir()
+    {
+        return u8"app_285310" PATH_SEPARATOR u8"depot_285311";
+    }
+
+    u8string GetRCT2SteamDir()
+    {
+        return u8"app_285330" PATH_SEPARATOR u8"depot_285331";
+    }
+
     std::string GetFontPath(const TTFFontDescriptor& font)
     {
         @autoreleasepool