fix(plate): fix disabled white plate texture and resolve text disappearing at distance

[CanerKaraca23]

Problem

1. White Texture on Disabled Plates: When HDLicensePlate is disabled in ModelExtras.ini (HDLicensePlate = 0), LicensePlate::Init() previously still applied the plate manager hooks (CCustomCarPlateMgr_Initialise, SetupMaterialPlatebackTexture), leaving plates rendered as a flat white texture with no vanilla text generated on singleplayer or SA-MP.
2. Text Disappearing at Distance: Mipmapping generation on plate characters (RwTextureRasterGenerateMipmaps + rwFILTERLINEARMIPLINEAR / rwFILTERMIPNEAREST) caused characters on the 256x64 dynamic raster to blur out completely and disappear into background color when viewed from moderate distances. Additionally, texture address modes were using filter enums instead of address mode enums.

Solution

1. Early-exit in LicensePlate::Init() if !m_bEnabled before installing hooks, completely delegating plate rendering to vanilla game / SA-MP.
2. Corrected addressing modes to rwTEXTUREADDRESSCLAMP for charset and plate textures.
3. Switched plate texture filtering to rwFILTERLINEAR without downscaled mipmaps, keeping plate text sharp and clearly legible from distance.