Sanitize custom Plasma theme name

src/modules/wmtheme.c

@@ -45,6 +45,9 @@ static void printWMThemeFromConfigFile(FFinstance* instance, const char* configF
         return;
     }
 
+    // Remove Plasma generated garbage
+    ffStrbufRemoveStrings(&theme, 1, "__aurorae__svg__");
+
     printWMTheme(instance, theme.chars);
     ffStrbufDestroy(&theme);
 }