Codechange: Remove some unnecessary c_str() when passing std::strings. (#12532)

Functions have been updated from `char *` to `std::string` since without removing `c_str()`.

src/social_integration.cpp

@@ -63,7 +63,7 @@ public:
 		std::string extension = "-social.so";
 #endif
 
-		this->FileScanner::Scan(extension.c_str(), SOCIAL_INTEGRATION_DIR, false);
+		this->FileScanner::Scan(extension, SOCIAL_INTEGRATION_DIR, false);
 	}
 
 	bool AddFile(const std::string &filename, size_t basepath_length, const std::string &) override