Coin Prefab update

[biyaniM]

Need to update all Coin Prefabs across all levels.

Please check the mark when done.

• [x] Level_0
• [x] level_1.5
• [x] old_level_2
• [x] S_G_level_2
• [x] level_2.5
• [x] level_2.75
• [x] new_level_3
• [x] new_level_4

[gautam17pranjal]

gems are present in level 1.5, old_level_2, s_g_level_2 and new_level_4 (when reviewed the PR)