Update meek-azure related strings to meek

From team#37 (comment 323254):

• Android preferences_tor_network_settings_bridge_config_builtin_bridge_meek_azure: meek-azure
• Desktop tor-bridges-built-in-meek-azure-name: meek-azure
• Desktop built-in-dialog-meek-azure-radio-option.label: meek-azure
• Desktop tor-bridges-built-in-meek-azure-description: Makes it look like you’re connected to a Microsoft website, instead of using Tor. May work in heavily censored regions, but is usually very slow.

Android doesn't seem to have any descriptive text.